A posting by ifyjetzzz, concerned about only having 2 returns reminded me of a question I had. I have a 16' x 40' pool with 3 returns. One return, in the deep end short wall is pointed down to promote mixing flow. The other 2 returns are on opposing ends of the two long walls, and I have them aimed to try and promote some counter-clockwise flow.
The pool was built in 1959 and the original 2 returns on the long walls were embedded copper pipes that came through the walls at a very low angle, so they really did a great job promoting rotation. When the pool was re-plastered, the copper pipes were removed and replaced with PVC that came through at 90 degrees to the wall. Surface rotation is now dismal with plenty of dead zones in the pool corners.
I've locked the eyeballs at about 45 degrees in the direction I want flow. That's the extreme of their position adjustment and when they're adjusted that way, the hole through the eyeball is half blocked by the body of the return, much like a ball valve hole gets restricted the further the valve is closed.
So, is there a style or brand of return that's better suited for extreme angles or do I have to do some plastic porting and polishing to improve flow?