Those are the pipes I was refering to. We anchored them the same way you specified. We could not find a drill bit that matched the OD (.=1.9") of the PVC. Instead we used at 1.875" bit, and sanded down the bottom section of the pipe to ensure a flush fit. Combine this with the problem of not having our top and bottom holes exactly in line, it can be seen why our pipes aren’t straight and tend to wobble. As for the bends in the pipe, this I’m a bit more concerned about. It did not take many human player shots to bend the PVC out of shape.