My intakes were all .10mm and my exhaust were .20mm. The spec calls for .10 to .15 intake amd .20 to .25mm on exhaust. Do i want to ne in the middle of that range or am i good were they are. Do they get tighter typically as they wear? Seems like they would Idk which males me think to set them closer to the higher number. So leave em or shim now?