Hi, seen a few comments on here since i posted,
I have been refining my settings across multiple 3060 cards and as per the comment from MarkusB you may need to play with the overclock settings to get a good setup. Ive now tried this about 10 times (moved the PC, tried other coins etc and its repeatable for sure across multiple cards).
One of my cards is unstable with the original overclock so dropped it to 2700 memory, the others are running at 2800, i get about 1 rejected submission per day on most of the cards but was seeing a lot more on that one card so dropped the overclock.
As people have said yes once the glitch happens you are locked into those settings. What i would say is make sure you have done the power limit too, trying to squeeze out more just causes more failiures (at least for me in testing).
Each setup will be unique based on ambient temps etc as you need it to glitch before the temp goes too high and it becomes limited due to temps etc.
One point i would make is one time i tried to rush it and didnt wait a few mins before doing the fan glitch and it just didnt work. Make sure that it has been mining for at least 2-3 mins MIMIMUM before attempting each card.
Again just trying to help others achieve what i have so dont shoot the messenger
I will keep trying to help people as i can but not a pro just trying to share my findings.