3/4 turn.
You saw me adjust yours last time.
Cover off, fire it up, back off each one until it clatters, tighten JUST until it stops clattering and no further.
Do the whole bank, shut it off.
Put 3/4 turn on each one (those are 1.5 turns full clatter to full collapsed, so we always put them in the middle to handle temperature and expansion changes), replace the cover, start it up.
By the time you have the cover on, it will have bled down.
Do the same on the other bank.