What are the specific problems you are having?
What have your players done? It's just that the AP is being too easy for them?
Being a bit more specific would allow people here to provide better help.
I haven't played or GMed Giant Slayer, but I've read somewhere that it's a very easy AP.
Plus, you have six players when the standard is 4.
And 25 point buy is also higher than expected.
The best you can do, as suggested, is to fix the encounters so they are more complicated.
Add more minions and maybe give some bosses Advanced template or something similar.
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If encounters are easy I'd suggest doing stuff to debuff the party.
Use a few baddies with a bestow curse SLA to drop their stats or give them big penalties. Poisons are lovely on finger-wigglers. Have an enemy bard use dirge of doom for a no save shaken to lower their saves and hit them with the longer-term debuffs. Then give the regular "good at fighting straight up" bad guys their shot.
The most important bit of advice for making encounters challenging for PC: Make sure you have enough encounters in a single day. If the PCs only face one or two groups of bad guys in a day, they're going to blow through them.
Keep hitting them until they're out of gas. Maybe even hit them once after that (lightly, so they don't actually die).
PCs aren't going to fear character death until they're nearly out of resources (spells, pool points, what have you)
Plus, I find that many encounters with a satisfying finale makes for more fun fights than a singular CR+4 creature that drops melee unconscious in a single full attack.
The issue of some of the PCs doing a lot of damage can be blunted by just shifting the monster hit points closer to max. Instead of average for their hit dice, you can boost to 75% to 100%.
For the witch, whose powers tend to be more save-based, you could generally swap out a lesser-used feat for Iron Will to give opponents a 2 point improvement on their most likely targeted defense.
If you're finding PC ACs too high as well, you could wrap a lot of this up by using the simple Advanced template in the Monster Manual. That boosts just about everything by +2 (die rolls, damage, DCs) and hit points by +2/HD.
The simple Advanced Template is your friend...Put that on everything.
And add an extra mook or two to take count of action economy.
But as others have said Adventure Paths are for 4 PCs at 15 point buy.
I wouldn't call that taking advantage from what you've said so far, you gave them a toolbox and they used it.
Maybe they made some janky ass OP build but so far it sounds like epic fantasy with 2 extra players is the problem.
Well, from what I've heard, giant slayer is very "Dungeon crawly" and they have a bunch of big hitters. I would suggest giving enemies max HP per HD, That'll probably make things feel a little bit better.
You created a problem when you gave them a 25 point buy.
You have to adjust all of your CRs by APL+1 at a minimum.
Giants are also very one-trick enemies. I ran book 6 for PFS and it was a total steamroll. When possible, elide encounters together to up the difficulty.
As Matt2VK said, most AP's are usually designed for:
A) only 4 PC's
B) 15 point buy
C) standard races
(and in my opinion this last is the big one)
D) assume near beginners or at least not a high level of system mastery
I normally find I have to scale up almost everything in published material with experienced players.
Also, as Serisan said, giants are mostly just big slow damage dealers. Though I'm not familiar with that AP. Even with a fairly consistent opponent type (giants), there are things you can do to up the difficulty and introduce some unexpected problems.
Agree with the advanced template.
Give a few of them some caster levels. Grease, obscuring mist, pilfering hand, create pit, web, pyrotechnics, mad monkeys, summon swarm, etc... can cause the party just as much trouble as the bad guys.
Instead of just tacking levels onto the singleton boss subtract 1 level but make it 2 of them.
Give one a long hammer, boost to dex, and combat reflexes to make use of that reach.
Give the fire giant a ring of cold resistance to take away one of his big weaknesses. Or better yet, maybe he is the chief's enforcer, so give him level of the winter witch sorcerer bloodline. Bet they won't expect that.
Give them some fast and sneaky allies or pets. Kobold poison assassins, goblin alchemists, dire monitor lizards, or whatever...
Also remember not every encounter needs to be an edge-of-your-seat-fight-to-the-last-man-standing kind of thing.
You created a problem when you gave them a 25 point buy.
You have to adjust all of your CRs by APL+1 at a minimum.
I'm more inclined to think it's the 2 extra characters than a few extra stat points. Right in the module it says "Battle of Bloodmarch Hill” is designed for four characters and uses the medium XP track. So it's not the players taking advantage so much as Bocaj tioneb not checking the material. Then you add in the the AP's are generally geared towards casual play and it no wonder things get obliterated.
So it looks like he need to boost things by 50%. That means he can be pretty free with the buffs. Add extra levels to bad guys across the board. Add a pile of expendable fodder as the group isn't focused on area attacks: Ratfolk work great here as they can swarm to pack in the minions and with the bonus to INT and dex make great alchemists, witches, rogues, ect. Sneak attack + swarm means easy extra damage, scent means attacks in darkness/blindness. Or you can always line up a bunch of 6th level gunslingers with Double hackbuts each doing 2d10+dex on 2 ranged touch attacks.