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one thing: time/action type.
1. if their extractions were swift actions to apply
2. their mutagens were immediate actions to turn on. have them experiment upon themselves daily with unpriced materials, and on the spur of the moment be able to Hulk out during combat and choose immediately what bonus they get. the duration could be combat restricted like int rounds/day + 2 rounds per level, like rage.
3. if their bombs were swift actions to make. so you could move, make and throw a bomb in the same round. and at higher levels make multiple bombs to throw as a standard action. 2 at 10th, 3 at 20th.
a short reminiscence:
in 3.5 the rules were more vague and i was able to have a halfling rogue that tossed alchemist fire and acid, and did sneak attack on his ranged touch attacks for the splash weapons. it was great effect to quick draw/twf and throw three sneak attack alchemist fires. the effect was a fireball for his level. but it relied on surprise.
if an alchemist could do the same, throw three bombs in a round, they'd get a focused fireball (or other energy type) that relies upon accuracy for effect. I think that would aid in their role as a combat striker. especially if their mutagen form conferred a resistance to their bomb type, so they could detonate the bombs in range of themselves or use them as explosive melee touch attacks.