Well to answer some of the questions or statements, yes I do bowl with a thumb in the ball. The league I am in, is the only one in the house for the summer, and I do not htink that they are oilin the lanes proper cause the owner is very cheap and could care less about the house.
I have played the down and in shot with every ball I own, with different speeds, rev rates and hand poss., and it does not matter, still jumps extremely violently. Plus I do not like playing that line, very boring(i will not get started on that topic).
I enjoy playin the inside, usually that is the only area I can play on the lanes. I have tried playin 40 sending it to 10, goin over the gutter caps, and I just struggle
thanx for the help