I also have a bullet train drilled pin over bridge CG kicked right 5 X 3 1/4 X 3 5/8 I struggled with the 2500 factory finish as the ball would skid badly through oil and way overreact on a little dry. The center I bowl at has a easy 31' medium oil THS I decided to have the surface sanded to 4000 and added polish, now this ball has a nice consistant roll and I can blow out the pocket with a down and in stroker shot at 14.5 mph. When I purchased this ball I was looking for something that would play through the oil but could not get it to carry on the back end. Now I can pick up 10 pins and bring it out after my Aura Paranormal gets too strong.