I'm under the impression that .060 is as close to coil bind that you should run on a good spring I have run a bunch of springs at .100 clearances and saw 15 to 30 lbs pressure loss after a lot of use. I reshimmed them to get the pressures back and ran them some more and saw no loss of pressure after that. All of those motors had BB stainless valves in them, no lightweight titanium valve experience on my part