To re-roll... or not to re-roll!

Hey all, my little 'afling thief (bounty hunter) just gained his first level-up! As such, I'm curios as to how people deal with the rolling process.

In Baldur's Gate, it's quite easy to simply discard a bad HP roll, reload, and just hit the "level-up"-button again, until you get the desired number. I've always used this method in the past, though I've mostly been playing BG2.

So when I'm sitting here, watching as my little thief's HP suddenly DOUBLES, I'm getting the feeling that maybe I should just let the dice decide. My very first roll for this character was "5" which nets him 8+5=13 HP, and that actually isn't bad at all. I'm contemplating wether I should just roll (no pun intended!) with that, or not - On one hand, it's the logical thing to do, but given my many difficulty-enhancing mods (SCSI&II, aTweaks etc, though no Tactics), I'm wondering if it'll be enough.

I know this is a peculiar question and one that I, myself, am the only one who can answer, but I AM interesting in hearing how you people roll! Furthermore, is there any AD&D 2ed players around? If so, then how is this "problem" solved in P&P?

Thanks for reading! / NN