Seems like your cadence is good. Most of what I've seen is that the general target RPM should be ~90. But my experience seems to be the opposite of most. When I started seriously cycling, my cadence was naturally high--often in the upper 90s. As I've gained fitness and strength, that has come down sharply. Riding at 90-95 now feels to easy, and so I often find myself going down the cassette to find more resistance. When I finally check, I'll be in the 75-80 range and then have to move back up.