Fix spurious timing/gtm9115 weekend test failures by tolerating up to 10% slowdown for 16 digit %OH

This commit addresses some spurious failures we've seen in the timing/gtm9115 test by allowing up to a 10% slowdown for 16 digit %OH just like we already do for 14 digit %HO. We've seen several failures involving the 16 digit %OH being slightly slower than the pre-V6.3-009 version in weekend tests but these have not been frequent enough for it to be a real issue.