Here's a thought: Remove the "Tank" from his description. He's anything but. Anything...but.
To be fair, he's just a Stormtrooper. In theory, there's a million of them...they're pawns. I don't view them/him as anything out off the ordinary although they ARE iconic and should deserve to stay alive a little longer than two Rancor slams.
I actually think his speed increase should be boosted excessively. Give him more shots, a lot more shots. He has varying damage so he could be deadly, or just annoying depending on the luck of the draw, just like their roles in the lore.
Now if First Order Stormtrooper had a taunt...we'd be in business.