I agree on velocity, although when my pump is running on high, the velocity is plenty high! Directions to skimmers is not a problem, PB was very good on that. Skimmers are on sides of pool, returns are on ends offset from each other. The natural flow of water is right to the skimmers and also creates a pretty nice, slow whirlpool effect when on high pump.

My only real concern is with solar, where I am trying to pump a lot of water through. I have 14 panels in parallel, so I can do very close to the theoritical maximum of 2" pipe (somewhere around 80gal/minute). Every little bit helps.