March 8-80 here as well. If I can see well with 80x I’ll shoot it, I was somewhere around 50x on the last relay. I generally shoot the max amount of power that the mirage allows, it doesn’t have to be a perfect sight picture but I do need to be able to have a decent point of aim.
I wonder if there’s a way you could affix a mirage shield to your pistol? I imagine the heat off that barrel has to affect your sight picture towards the end of a relay.