I'm no hydraulics expert, but I can suggest: was your skimmer located with wind in mind? Most areas have a prevailing wind. A direction in which it usually blows. Your return should be placed to take advantage of that wind, so that surface stuff blows into it, instead of away from it. I'll defer to others for the return locations. I think you want your pool water to spin. That'll drag surface stuff past your skimmer on a calm day, and mix your water around and around, from deep end to shallow. That's good for mixing in chemicals, getting all the water through the filter, and evening out warm spots, etc.
Someone better at this will be along soon, I'm sure...