Wondering if theres anyway to adjust the throttle, it has good responce and snaps back on release but it turns to easy, when you hit bumps its hard to keep it from jumping, seams you should be able to tighten a spring or something, dont want to mess with the friction screw because all that does is prevent it from closing on its own.

 

Possible your t-cable is a bit too tight. I adjust mine so that there's just a slight amount of slack in the grip which pretty much eliminates any "jumping" when going over bumps and RR tracks.....

 

^^^ This

One other thought would be you're also possibly riding too tight on the bars; too tight on the bars you'll transfer bumps directly in to the throttle. My throttle has basically zero cable freeplay but I ride very light on the bars and never experience any issues.

Loose and limber is smooth