I never truly enjoyed control line flying until finding the Uniflow tanks. They work and are a superior method for plumbing your tank.
The position of your tank is still important though and Uniflow will not solve this. On most C\L aircraft, tank height is adjustable. Moving the tank up or down slightly effects how rich or lean the engine runs upright or inverted. The goal is to find the spot where it runs the same. Generally I have found that a side mounted engine ran rich inverted and needed the tank lower.
This will be the same with RC aircraft. Tank height is not something most RC flyers care about unless the engine does not run properly. In C\L it is a very important factor in a properly trimmed model.