So I've been thinking this over and for the most part I think the way Mch plays is fine but I understand how the job can feel boring or simple with it's 123 combo and heat spam.

This is my idea on how to change it.

123 combo still remains but we get 2 proc'd weapons skills. Split shot would have a 50% to proc Lead Shot; lv54, Lead shot making a return, and Clean Shot would have a 50% to proc a new weaponskill, I call it Mercury Shot; lv60.

Hypercharge just lowers the gcd on weapons skills down to 1.5 seconds and gives 100% chance to proc Lead and Mercury. We still have to get 5 hit minimum into Wildfire but instead of Heat Spam we do 12345 or 12435 rotation however you wanna look at it.
I'm also thinking that the heated variants are only accessed during Hypercharge with the 123 being unlocked at lv68 and the 45 unlocked at lv 78.

Heat Blast is now just an ability to dump Heat if you aren't gonna be able to to Hyperchage before the enemies dies. Also Trait that gives Clean Shot a chance to proc Heat Blast without cost.

No more Heat Blast spam means no more bouncing between Ricochet and Gauss instead Lead resets the recast of Gause and Mercury; Ricochet

Lead is still places a dot and my thinking is that if if you get a Lead proc and your enemies is still taking dmg from a previous Lead Shot then it works like Thundercloud on BLM

Auto Crossbow is just a combos off of Spread or it can also be a proc.

Flamethrower is just a turret that shoots flames in a cone before you. Only cost 20 battery.

The return of Dismantle cause I miss it.