I would work on the actual technique at whatever cadence happens before fixating on the exact RPM. My technique got a whole lot better when I got on a trainer at the bike shop on a February "open house" day and could just focus on the skill (with coaching from whatever video he had going).

We have two very fast riders in the club. One is slow cadence, the other fast. They both have efficient pedal strokes - it's just one goes faster than the other. I tend to have a low cadence myself. If I go too fast, I am more likely to "mash." I'm going to try those downhill drills (on what passes for hills around here) to improve my pedal strok when my legs are moving fast... could be fun