A “Re-valve” Will not change you ride height at all.
Revalving only changes the way the fluid is allowed to travel through the shock not how much spring pressure is opposing gravity to determine how high or low your YFZ sets. If you want to lower it change to a softer spring. Then test ride it to see if you can adjust you shocks to your liking. If you end up adjusted all the way to one of the stops then consider a re-valve.