And there's ONE of the big differences between 6's like you and the higher level players. You see, it IS like riding a bike. I practice MAYBE an hour a week, and I still maintain my game. The reason I can maintain it with that little practice is because I have a very solid preshot routine.
A lot of people at your level tend to dismiss just how important a solid preshot routine really is. I have heard "that's too technical", "that's too rigid, it takes all the fun out of the game". Those that say that just refuse to understand it. At first, it is rigid, and thought consuming. But, if you set up the same on every standard shot, pretty soon you don't have to think about it, it is automatic and not rigid anymore. You just automatically set up correctly.
When you are set up correctly to start with, all you have to do is adjust for the speed of the table. Everything else is already there.