It will be interesting to see if the FM filter changes anything. You can compare with the Live Bandscans in your area at the rabbitears.info website. The dark blue line in the graphs is the signal quality. 70s to near 100 in Linovia and Anne Arbor (guessing you are near Detroit.)

There is another ...

Unless you are seeing breakups, 75% signal quality is perfectly fine and nothing needs to be done. Nothing mediocre about it. So long as it isn't bouncing below 50% and symbol quality is a steady 100%, you're good. I have a few stations in the high-50s that are perfectly stable.

You can get 100 ...