If I'm turning from medium to large creature, I'm getting +1 size modifer to my CMB/CMD. But at the same time, I'm getting -1 size modifer to my Attack Bonus and Armor class.
So this means, maneuver wise, those bonuses cancel each other out?
That's great! Thank you for clarification.
According to the Core Rulebook, any penalties to AC affect the CMD, so the -1 penalty from Enlarge Person would counter the +1 size bonus to CMD.
The +2 Strength bonus also counters the -2 Dexterity bonus as well.
While it is true that
Combat maneuvers are attack rolls, so you must roll for concealment and take any other penalties that would normally apply to an attack roll.
with the same effective text for CMD...
You must also take into account that
The special size modifier for a creature's Combat Maneuver Bonus is as follows: Fine –8, Diminutive –4, Tiny –2, Small –1, Medium +0, Large +1, Huge +2, Gargantuan +4, Colossal +8.
with the same effective text for CMD.
Bolded for emphasis. You cannot apply two size modifiers to a roll, so the specific bonus to CMB and CMD overrides the general penalty to attacks and AC.
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This isn't really on topic, but I want to say; any time I see the word ENLARGEMENT in capital letters I fear my spam filter has failed :)
Size bonuses do not stack, so if you have a -1 size bonus to CMD from AC, and a +1 size bonus to CMD from CMD you would only apply the highest number (+1). Hope that helps.According to the Core Rulebook, any penalties to AC affect the CMD, so the -1 penalty from Enlarge Person would counter the +1 size bonus to CMD.
The +2 Strength bonus also counters the -2 Dexterity bonus as well.
Only problem you have here is that a -1 size modifier is not a bonus, it's a penalty, and penalties stack with bonuses, generally.
It's a pretty safe bet (considering the sheer number of stat blocks that we can reference) that the special size modifier to CMD replaces the normal size modifier to AC, though.