A reduction in your normal psi would indicate a restriction on the suction side of your system....more clogged leaves maybe in the pipe?

If the leaves did not get out of the basket, the impeller should be fine. If it somehow DID get damaged, lower psi and resultant less flow would be the symptom. I'd check that after everything else, however.

I would suspect some type of clog on your suction side and, if it's entirely clean, then I'd inspect the pump