I recently purchased a 35+ year-old Valley Barbox for which I bought new Valley cushions from Seyberts. The table played well for a year, but over the last 2 months I've been getting ball acceleration off some of the rails. Now, if I hit a ball medium speed at a rail (not jumping the cueball), it hops off of the rebound. I tightened down the cushions which helped some of the rails, but I'm still getting a hop on 2 of them. Any ideas on how to remedy that? Thanks.