So basically what determines the smoothness of a shot is the amount of time it takes to accelerate the paintball from 0 to 280 FPS? The longer it takes, the smoother the shot and vice versa. So therefore having a longer dwell time would create a smoother shot. Kind off like a car's frame in a crash, only with acceleration instead of deceleration. An older style car with a more rigid construction would decelerate faster in a shorter space of time, obviously causing more damage to whoever was inside. On newer model cars however, they are equipped with crumple points so that when the car strikes and object it experiences a slower deceleration over a longer period of time. Am I getting at the right idea with that comparison? Also I now realize that "shot quality" is hard to quantify because it is a factor mainly based on personal preference, some people might like the shot of a Vanguard Demon over the shot of the Luxe. So in their opinion the Demon would have better shot quality. I'm sorry for being rather ambiguous with my wording in my original post.
I really love my mini, The stock trigger is really....floppy is the best way to describe it, but I got a CP sling trigger which has a spring return and bearings, it feels alot nicer than the stock trigger. I think the shot quality of a Mini is pretty nice, there is a barely noticeable vibration because of the spring return bolt, but Im pretty sure the G4 has that to. And as far as barrel rise or "Kick" theres not any way to reduce that, that is just a matter of physics. As long as there is a paintball coming out of the barrel, there will be an equal and opposite force being distributed to your setup. The only way to reduce "kick" is to get a heavier setup.