Most of our stuff is pure race, not much idle cruize time
I've run the 7's in the mid boost levels (10-14) and did have them in at 18lbs without "noting" problems but, I wanted to work out the timing without having a glow plug being a cause of problem. I played it safe and went to the 9's, they we're a little cold for sure. The 8's were fine, I was playing it safe.
I'll probably run 7's in my twin turbo 565 street beater. defiantly want to keep the plugs clean in there. It'll never see more than 12 to 14lbs and has water to air w/ heat exchanger.