No no no, they're too finely balanced for that. +3 S can bring things to ridiculous levels, and coupled with her massive I plus the fact Killer weapons ignore saves, she'd basically just murderlize people before they could retaliate every single time, thus making the reduced toughness a moot point, especially considering she's already formidable in that regard. Nice touch with the bike though, though be warned Deathwatch will give you a normal bike once that bike is inevitably destroyed.