Heroism and fly are good for anyone, and it sounds like bombs are your thing if you're referring to 'my 2 front liners'? If so take a look at bouncing bomb admixture.
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Heroism can be used via alchemical allocation and has the duration to be easily precast.
Monsterous physique is a good option. One extract give you better offense, defense, your choice of movement, senses. Level 2 give you access to mimicry (doppelganger).
A doppelganger is proficient in all weapons, armor, and shields. In addition, a doppelganger can use any spell trigger or spell completion item as if the spells were on its spell list. Its caster level is equal to its racial Hit Dice.
Like wise with fey form.
Echolocation solves a lot of problems.
Keep a spot open for remove spells or resist energy.
Earth Glide is good for scouting.
These are suggestions based off a number of points; fun, interesting, classic, protection, party makeup, gimmicky, etc. Let's go.
Level 3s
Amplify Elixir - Increase any Numbers on a potion by half or if no numbers, extends it. Can't work with instantaneous which does limit it but comboing it with Alchemical Allocation which lets you drink a potion without using it well, you can get some silly ideas going.
Bloodhound - Scent. Just Scent but with some bonuses to it skills based around it. Handy if you just want Scent and nothing else.
Darkvision, Communal - Dependent on Campaign and Race makeup.
Gaseous Form - Given that you fly, you shouldn't get attacked. But this makes sure you don't, even in close combat. It's a Get of Death card.
Lightning Lash Bomb Admixture - Electric DoT that stacks with your specialty bombs. Not other Admixtures.
Level 4s
Echolocation and Eyes of the Void - Magical Darkness? Ignore it.
Freedom of Movement - AKA "Let me go". Decent to have 1 or a couple made up. Dependent on your DM though.
Persistent Vigor - A niche spell but it's has it's spot. Fast Healing 2, immune to Bleed, Sickened and Nauseated? Oh and lets you recover from diseases and poisons easier? This isn't required but it's nice to have in the back pocket.
Universal Formula - Cough ouch that's a price tag both the spell slot and the 100 cash. But having 1 extract that can be ANY extract can be handy. Only up to level 3 though. Make and store.