big events are magic for times! so much traction compound down and lots of rubber from slicks, instead of street tyres ripping it all up.. i got second gear to hook on full power on my crappy street tyres when i ran 124mph. i couldnt believe it lol, felt so good. i think it was the test and tune directly after a jambo. then some other time of year i had to lower boost by 5psi or more maybe to hook on the same tires..

what rpm are you running upto? obiously its not ideal to increase your rpm to suit your mph.. can you fit any larger tires under those guards? you must be a little nervous about your actualy rpm limit if your taking small steps up. good luck getting to 9.9x @ 15x!!! i hope it has it in it!