There is no such thing as a perfect pocket size that will work on every pool table built and sold, and yes i do know pockets and the effects they have on balls being pocketed, as well as Mark Gregorey does, while not knocking anyone elses knowledge of pockets and their design, but a lot of their knoweage they got from me as well over the years. There's a reason Diamond tables have standard 4 1/2" corner pockets and 5" side pocket that besides the fact the Greg Sullivan wanted to try and set a standard pocket opening, and I'd be willing to bet no one knows the main reason why, no matter how many tables they've worked on, or how good of a table mechanic they feel they are. Pockets vary in size like cars vary in the size of the tires they drive on, there is no such thing as a one tire fits all rims. Just as drag racing tires work best on the drag strip, they don't work worth a shit driving down the freeway in the rain....make sence? The only way to create the exact same pockets on all pool tables, is to build the rails to have the exact same corner and side pocket design in the rails, and i don't mean pocket opening. I'm talking about the difference between #6 pocket irons, Gold Crown casting, Gandy pocket casting, antique pocket irons, no pocket hardware like Diamonds....the variable designs go on and on, like all the different rims for all the different tires, for all the different vehicles they're mounted on. Well, players new and old, experienced and inexperienced all vary as well. The knowledge i have allows me to design pockets to the customer I'm doing the work for, based on their skill level of playing, and their understanding of their pool table design. So, though yes, i consider myself an expert in my field of work, the reason i didn't answer your question in the first place....is because there is no correct answer to your question.