Friedcat said at higher speed there is a chance that the micro is not capturing the nonce which would explain why speeds may not be as high as they should. I'm hoping he may post some more info on here.
Well I am not sure, was running it from a lab supply while I was experimenting, I remember it was right around 1.4v although it was over 3A so it wont work the the current regulator, however now that it works I might not need so much voltage before when the software was not working I spent a lot of time "trying everything" finally just left it. Monday I plan to do a better job working on voltage/current/speed parameters. Been running 4 hrs or so.
A:567 R:0+0(none) HW:14/.61%
I never tried 17mhz but I have a 18mhz installed and it will not run @ below 1.4v.