200BB Live 2-5

2 limps
Hero raise HJ to $30
SB Reg makes it $125

Folds to Hero

In this spot, do we ever want to be flatting KK/AA preflop? I prob want to be defending something like AKo, AQs, JJ-QQ as flat calls, and 4betting AKs, ATs(as my bluff, think it has good blockers and equity when called), KK/AA. But if we are never flatting AA pre, we are super vulnerable on low boards. It seems viable to me because the SPR is already going to be low with $250 in middle and a stack depth of around $750-775. It seems like a thing, and I guess I am just looking for some feedback to validate my reasoning.

Appreciated