Yes, you're probably right. I prefer to keep the D&D HP values, but that's non-standard and may be too much.
Does your algorithm match creatures already published in BRP well? For example (dragons are too variable)...
T.Rex: STR 10D6+32 (av.67); CON 4D6+21 (av.35); SIZ 6D6+32 (av.53); HP 44; AP 10; Bite 50% 2d6+db; Claw 35% d4+db/2; Kick 45% D6+db.
My way would give 'em 80-90hp (from MM, not sure how many HD they have in 3.x). How about yours?
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280/420
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