While my reply will not likely be helpful, I will tell you that I have the same planer and I DID NOT REALIZE UNTIL READING THIS THAT IT SHOULD ONLY BE CHANGED WHILE RUNNING. I have changed mine while off and it didn't "click" like I thought it should so I moved it back. It seemed to go back fine and I used after doing this. Additionally, I've only actually used my planer on the high RPM setting at 1/64-1/32" cuts as I figured this this would be better. I'd rather run it through twice and have a smoother product.
Mark
Mark