I've been trying to increase my cadence this week. Managed to go up from 165 to 178 by listening to a metronome. It's not too bad if you've got a podcast on at the same time as it blends into the background after a while. The issue now is that my heart rate has gone up from 142bpm to 152bpm. This is out of my zone 2 so I need to get this down. I am running a bit faster with this higher cadence but it's very difficult to run any slower and keep the cadence up. I think I'll try to stick with it for a while and see if my HR settles down, otherwise I'll have to go back to plodding along.
I have found the higher cadence gives you a lot more momentum. My foot is barely on the ground for long and feels like it's constantly rolling into the next step rather than settling into each step before pushing off like I was before. It's hard work to keep up though, my muscles are sore in different places than usual so I guess I must be building up the strength to deal with the faster foot turnover. Hopefully it's worth it in the long term as it should result in 6% to 9% increase in speed if my stride length remains the same. That's like wearing 2 pairs of vaporflys