I usually spin way above the recommended 85-95 rpm - is that bad?

Do you run as well as ride?

My running cadence is inherently lower than my cycling one. I suspect things are more complicated for those that do multiple sports.

If you don’t why not change your Cassette/Chainrings to mean you can spin up those local hills? My target this year involves as much down hill as down up hill so there’s no possible combination of gears & I need to be able to vary cadence outside comfort zone. You might not need to.