Curious 36120 problem

[Gustav]

It will run on 16 cells fine under load,but with the wheels off the ground it will do the glitch thing when it reaches a certain RPM.That's what's confusing me.

It does seem like a timing issue or loss of position when it reaches a certain rpm.I can't open the program for the programming cable even though i have microsoft office and winzp.i'm wondering if the 'slow power' feature is on.It reduces rpm limit and is for <20k rpm set ups.It says this feature is on by default on 24MHz controllers.Is the 36120 24MHz?

I hate to give up but this is realy doing my head in,i'm contemplating trying to return it and buy a 32.170W instead,it's huge but i have a seperate upper deck for the esc so it would fit.