Pick your poison, but I go with peel type washer since the can be reused. Hence, about every 6K'ish rounds, I pull the FS's so I can get the crowns fully detailed cleaned.
Note, if on a NM rig, I just face the back of the FS so I can time it out that way instead. The reason behind this, the FS is going to be pulled every 1K of rounds or so to get the recessed crown detail cleaned (we are talking rifles in the sub-MOA,and the crowns need to be fouling less to maintain this).
On the peel washers, just peel off layers until you can get the FS to hand tighten to about 10:45, then wrench the FS to the 12:00 position.
With the crush washer, hand tighten the FS, then wrench to 12:00, since the crush washer is going to retain the needed tension as it being crushed that one time (read do not over index and try to come back, and don't try to go another wind after you hit 12:00 since you may run out of crushability on the washer instead.