Skimmer not catching debris floating on surface

[WillB]

My pool is rectangular laid out east and west.
The skimmer is on the west end.
If the wind shadow caused north winds they would blow across the pool and be neutral to the skimmer.
I guess I could fashion some kind of wind sock and see if there is a persistent wind blowing against the skimmer.
If there is I don't know much I can do about it, but at least I can stop wasting time trying to fix it by adjusting my jets.

I should have added that there is a 3' rock wall on the north edge of the pool, which should block any northerly ground winds.
I haven't noticed debris collecting on any side of the pool as though blown and kept there by wind.
It seems to just float around randomly and not be pushed toward the skimmer.

BTW- I appreciate your trying to help me with this.