Here is a good thread by RKC regarding your question. Sounds like you might want to check your math again.
You have 3 pool tables, let's say they're all 8fts, for the sake of argument, they're 3 different manufacturers as well.
When the nose heights on all 3 tables are measured, all three share the exact same nose height, 1 7/16" and let's say they all have brand new cushions on the rails.
Table One; the tables banks the balls perfect, balls come off the rails perfect, everything is perfect.
Table two; the balls die when banking them, have to bank hard to get the cue ball to go 3 rails around the table. When trying to get position play, you have to shoot harder than normal to get the cue...