Do you have a "spyglass" you watch when you backwash?
Are you backwashing until that spyglass first goes cloudy and then clear?
If so, then you are still collecting a lot of stuff from your water.
Try adding a skimmer sock to your skimmer (they are cheap) and see if it clogs up instead. You can rinse it out and reuse a skimmer sock for about a month.
Carl
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