I have a 1.5 with a 2.0 core. I just started having issues with velocity drop on my luxe when I walk the trigger. If I am one balling the gun shoots great and consistent. When I walk the trigger the first ball or so will shoot as it should but after there is an extreme drop in my velocity. I've had the issue before but just took the bolt apart, re-lubed it, and then it shot great. Help please.