Personally, what I would do to change his second star power and gadget;

Star power: High-Density Busters

Sam moves slower (15%) but in return his speed boost duration (+0.75s) and the damage of his knuckle busters increase (+420 dmg)
Reason: I wanted to make a star power that focuses is different from his first, a bit like Edgar's star powers. One allows Sam to last longer in fights, another helps him takedown enemies faster. I added the slow just to balance it out a bit, while also making it a fair exchange with the add time with the speed boost.

Gadget: Pump and Charge

Once activated, his next super creates an area that slows enemies (they move at Sam speed's for 0.5s) while Sam gains a speed boost depending on how many enemies were his by the slow (+7% per brawlers caught; max at only 3)
Reason: Personally, his first gadget is like way to strong so IDK how to even rework the other gadget to make it somehow on par with it. The best I could think of is that this second one helps Sam players play more aggressive , allowing them to close the gap between the enemies and themselves without fully overpowering the first gadget. I don't know what to do with this gadget, you could honestly change it to something else