.0005-.0015 is fine for a factory built stock engine that's built for longevity but for something that's built to make big power .0015 is the very bottom of the scale of what I like to see. Have you tried swapping around bearing shells to see if you might be able to split the difference? There shouldn't be much difference between them but even if you can get another .0001-.0003 out of it it'd help
