Bossk, BH is pretty awesome fig, he'd be a lot better if his HP was higher though. But the Stormtrooper is the best trooper ever. Especially since A&E. Chewy, Enraged Wookie is a really cool figure, but yeah he is kind of fragile despite his monster HP. The Wrangler probably is the best option with chewy.

I will have to pull out that Bossk, BH and give him a try...

Just to note, you say STs get a "+15 for 30" damage with Thrawn, Piett's Opportunist, and Vader CotS's reroll. From what I've read, the +4 attack you get from Vader's reroll can not be stacked with Thrawn's +3 to attack (stacking CE's that affect the same value), so you'd only get a +12 attack (4 base +4 Opportunist +4 Vader's reroll).