Funny, it's been my experience that no 2 GCs play the same, as they all play different....maybe it has something to do with how each room cleans and takes care of their equipment! All tables can change in how they play from one location to the next, as well as who works on them! If you feel so strongly about Diamond putting out such a bad product, why don't you offer your services to them and design a better playing table, shouldn't be a problem for someone as knowledgeable as you are!
Believe it or not, I'm actually a Diamond customer. I go to their DCC event often. I play on their tables there in the tournament, and in gambling matches. I own their ball cleaner. I bought Cyclop balls from them. I visit pool rooms that have Diamond tables all over the country, and give my business to those rooms.
Anytime someone doesn't like the way a Diamond table plays, you insult them. You have a close ear of the Diamond folk, obviously. I'd be willing to bet, that if they ask you what people think of the play, you say something like: "Most people love them, except a few a-holes on AZ that complain about their rails".
I met Sulliven and Smith at the DCC, and asked why the rails bounce so much maybe 5 years ago, and they said it is now fixed with the Blue label (that Sulliven gave you credit for).
I disagree it is fixed.
If people like me did not complain for a decade all through the 2000's, there would not even be a need to change from the Red to the Blue. If people like me did not complain for a decade Diamond would have never improved the pockets so they don't scuff the balls.
Of course the GC's don't all play the exact same. But, there is an average level of play, and some tables will bounce slightly less or slightly more than this average. On the GC, this average bounce level lets arbitrarily call a 5 on a 1-10 scale. And it may deviate plus/minus 1, for a range of 4-6. On a Diamond, this ball bounce average is much higher, maybe an 8. And it may deviate from 7-9.
My job as a customer is not to provide a solution. My job is to complain of a problem. It is the company's job to come up with a solution, or decide one is not necessary.
Believe it or not, I don't only complain. My home room just had all 20 of their GC's recovered this week. I went up to the table mechanic, and said: "Thank you for your good work recovering the tables, and keeping the tables the best in the area for years. I know pool players only complain about tables, and I wanted you to hear a compliment for a change." He was very appreciative.