Crown hst adjustment

Hi
Tried searching here no luck. Know to adjust hst for mk2 needs increasing cw and test with chrono. Curious roughly in 1/4 turn each time or more? At present on max average 818 , target about 840fps, like every body else searching for Teds sweet spot. Please no rude suggestions lol.
Just trying to save replace and 
remove everything numerous times. Not stock of course.

safe shooting