Ok we've already established I play fast and loose with my monsters, so what about the dice?
I view the dice as a guideline, not set in stone. I don't even often give my monsters a set to hit number. It's almost like I do "high/low", but not completely. I take into account AC, a bit.I've had a very few canny players realize this and always go with Con instead of Dex. They tried to share the wisdom but luckily for me, they were unable to impart this wisdom. I extend this to the players to some degree. Last night I played and the cleric was rolling terrible on his channels. He rolled particularly low on his last one(6 on three D6). So with my eternal motto of "What does it cost me?" I let him reroll(he got an 8 the second time). I will often do this with a player who has been consistently rolling low damage, again "what does it cost me?" The players will even say "What does it cost you?" in supplication, usually I'll give in.
Monster saving throws are tricky with this, I am very inclined for monsters to "fail" rolls that involve damage.
Saves that lead to minor penalties to hit and damage are also likely to fail.
Don't let the dice get between you and a good game.
That's all for today got a lousy nights sleep and there is housework to do!