The impact comes regulated, so there's only so much you can do with it. Besides that, a lot of people do not like the idea of having to tweak a gun they've just paid $1900.00 for to get it to peak performance. They'd faster send it back & get it repaired or get something else.
Man, if I pay 2 grand for a gun I want it to come and be able to use it without having to mess with anything, even the slightest issue would really pi$$ me off big time
I just ordered mine today...so I will not be able to mess with it for a few months. Drat.
I have been surprised myself with all the serious issues with the impact, FX normally turns out awesome guns but being built like a swiss watch isnt really a good idea for a gun.