You might want to add a list of your mods, as I've already forgotten since your last post. But a 15.0 @ 93 is a pretty good time, considering you're still in the 2.5L.
My suggestion would be to NOT run the nitrous off the line. That is the part of your time slip that needs the most work. Your 2.3 and 2.4 60' times need to come down to 2.1 and 2.2, where nitrous is going to make that very tough to control.
Mark
