I'm telling you, bump the pressure up to at least 18. It sounds counter- productive but it works. Plus, like I said earlier, you gain some MPH on the big end.
I dropped the pressure to 15. I was running 14.2/14.3 at around 94mph. (dont have my time slips handy) I know when tire pressure was higher, i was running 96mph. But never got the 60ft that low. So, still working out some tuning.