Asked Greg about this and he told me that not all Diamond bar tables will play the same. It can be the rail height or even humidity that causes this. I know that the tables we played on in Reno at the USBT played just fine.
He said that if anyone is having trouble with their Diamond table, they can call him. (812)989-6665.
LOL, it was the tables at the USBT that prompted me to make the comment. I saw a ridiculous number of unusual bounces off those rails, and many bounce so stiffly that they don't seem to catch running english properly at all.
It's not something unique to one table or two either, I think there's an actual flaw in the design which is causing the problem. Greg should talk to several of the top players and see what they think - I'm sure many will agree with me. He should also take a good look at the Accu-Fast rail because I agree with the previous poster that they are clearly doing something very right there.
Don't get me wrong, the Diamonds are excellent tables, and the product is totally first-rate in every way. The issue with the bounce off the rail is something that definitely warrants some study, that's all. I mean, why not make the tables better if you can?