Aren't FC's HP capped at 280 now? Even if it has to be done manually by an imm, I'd be wary of giving full value to any "extra" hp above this cap when choosing a reroll, as you are very likely to lose them.
For reference: http://forums.wotmud.info/viewtopic.php?f=3&t=5286
Reroll help for a FC
Re: Reroll help for a FC
What Elyse said. I also would have stuck with the original stats.