Is my pump oversized? 1.5 HP / 7500Gals

[MountainStone]

Wow. You guys really know your business; thanks so much for the thoughtful analysis and advice. What a treasure this forum is due to folks such as yourselves.

I'll have to contemplate which solution works best for me, balancing ease with cost. My complete unfamiliarity with the pump makes me hesitant to tear into it, though I'm handy enough with tools. Is there a tutorial/DIY for replacing the impeller & diffuser somewhere, or is it simple enough to figure out just by disassembling it? Do I need torque specs, loctite, etc? Doc recommends replacing the exposed rubber parts, but I dunno what those are; is there an impeller kit that comes with those rubber parts?

Thanks again!

[PoolDoc]

If you want to do it, I'll walk you through it.