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Did the dealer do a full dyno tune session?
It is their kit and that SE tuner has lots going on for it.
The dealer not being able to hit the tune would worry me maybe a bit.
When you say die do you mean shutdown completely, or do you mean just go soft in the power band as you are riding.
Engine fully warmed up?
You say running rich do the plugs show that?
Is it throwing any codes? Start Here
Check for intake and exhaust leaks, vacuum leaks the guys at a dealership can make a mistake just check it all one more time for them.
Bottom line is you paid a fair amount of $$$ FOR THAT KIT and the dealer has an obligation to make it right in my mind.