I found out that with my herd, it could come down to 8 %, and not more, and then have adjusted to 1,1 kw with the pellets i use now, because 7 % is too unstable for the flo85
If it is a 16-20 kw standard herd or an open herd, it is just to see how low it can be without smoke.
I normally use 1,5 hours on checking 10% power after last adjutment, because it is the most importend thing for a pellet burner to run smoothly