You don’t need the Bite really.
You’re there for the Infusions* and more INT is more Infusions and skills.
* - coming out of 3.5 it’s great fun to slice and dice and feel like you’re totally broken but once you figure out what else you can do - and what are the biggest threats - it’s just a nice mix of decent damage and a source of something (Infusions) you can’t get on any other class.
EDIT: Advanced Rogue Talents aren’t anything to sneeze at, so that a good reason to choose the class
But other Alchemists can and Touch AoE debuff + damage is also unique and a better fit for neutralizing the biggest threats you face. So I went Grenadier for Unfair P:K and was much happier with that.
In P:K you can get that from a companion, where you can’t in Wrath. If I wanted Infusions in Wrath and something fun I’d just go Metamorph for Stealth Leopard/Smilo/Dragon I think. The Summoner one also makes good use of the shitty 5th level spell slots.
Best place for Vivi in Wrath is probably the last eight levels on Wolj but I’ve been making him into ES20 Transmuter and that’s been really good.
Haplo could do 5,000 damage a round on a Starknife-wielding Chiurgeon so don’t let that fool you.