Phil, in all honesty it was probably the motor running out of torque, oil, velocity and just good old get up and pep.
I got a chance to take a run on this year's Bonafides yesterday. They are very easy to turn with great edge hold. On hard snow I would give the edge (pun intended) to the Bonafide.
I need to get back on my Rustler 10s again to make more of a comparison.
Any more input on Rustler 10? Trying to decided between Rustler 10 or Enforcer 100.