I try not to post while high, but I thought I'd throw this out there anyway .... when designing my cabinet, I seem to recall reading somewhere that the intake should be at least slightly larger than your exhaust, particularly if you are not using a fan to pull the air back into the cabinet (passive air flow?). This also helps replenish CO2 levels.

So, I don't think it's a problem of not enough air being pulled 'out' of the room, but not enough being pulled 'in'. I have been known to have bouts of dyslexia, especially when high, so I would research this a bit.

In any event, I wish you luck finding a resolution! I know all too well how bad heat can be.