Well, I bought an second hand Inferno yesterday. It has roughly 40 games on it. So I went into the proshop and got it weighed and he said that it had no side weight, no top weight, all it had was bottom weight.  
I bowl at 15 mph, low revs, medium-heavy oil, and tend to hit up on it(trying to get out of that).What will the ball do if i just plug the thumb and put inserts in it. Picture of current layout below.
Inferno Picture