Regarding the right ramp: for my GB it was sufficient replacing the metall piece Holding the ramp by a shorter one. The current one is 2'' and I used 1.5". You can simly unscrew the metall piece from the bottom of the playfield After removing the ramp and out in the shorter one. The difference makes the Shot significantly easier.
The angle is certainly another reason for the Shooting problem, in my opinion a Design fault. But als this is more difficult to solve I would Start with the Metall piece.