i was ballin the other day with my tippmann a5 with a flatline and my balls were curving like hell. my velocity screw is missing, so im assuming the velocity is as high as it will go. also it chops paint sometimes. i clean the barrel every time it happens though. is there a way to improve accuracy so it'll shoot straight? is there a better barrel i should buy that will improve accuracy? does it curve because its not a high end gun? thanks for your help