Just thought I'd update this in case anyone else is having a similar issue. I went through and and Checked all the electrical connections and set the TPS and still had the same symptoms. The TPS was actually very close on this sled. I swapped the clutches off my 16 and still had the same results. I then brought the sled to Carls Cycle in Boise. Jack took it out and rode it and he felt that the motor needed to be loaded harder with the 17' fuel maps and the stock helix wasn't cutting it. They installed their clutch kit on it which consists of different weights and a different helix and it is a whole new sled. Completely took care of the cutting out issue and track speed/power is back to that of my 16'. I'm a little disappointed with Polaris that I had to spend extra $ to get my 17 to perform the same as my bone stock 16' but I can't say enough good things about Carls and their service department.
I've now added an SLP pipe and feel the performance of my 2.6 Belt drive 17' is now on par with my 16' 3" chaincase. The bottom end is still stronger on the 16, so I'm going to gear it down via Pro quick drive pulleys or a TKI kit and I think it will actually be better.