[Kevin Sevcik]

Your problem with the 6" wheels may have been too much compression too quickly. Your problem with the 4" wheels is definitely the lack of compression through most of your shooter. I understand that you can't flip the hood around or anything at this point. I think you still have options for increasing your exit compression now that you have 4" wheels. You need to make up a liner for the exit side of your hood. This can probably be a piece of lexan that fits inside the hood, and a few spacers made of wood or something that push the lexan away from the hood and closer to your wheel, increasing your compression. You might also benefit from friction tape on your wheels to make them grippier, and I still recommend a flywheel or heavier wheels so you can store up energy and your wheels can maintain a higher speed as the ball goes through.