How is your return pointed?

Aim your return away from the skimmer and adjust it so that you see the surface motion ~ 10' out. This should set up a circular flow that will ~ maximize your skimmer action.

Make sure the weir is in the skimmer and moves freely and that the water level is no more than 3/4 of the way up the skimmer mouth.

Next weeks rain should abate the problem for a little while.