OK the tail cone issue has been resolved, here is what JetJoe china said:

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Gabe want all his turbine ship to USA with one pc tail as his special request.

Any way we can ship you one pc tail pls re cfm your address again.
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This would explain why all US engines have one piece cones, and would also say something about JJ's support - sending me a new cone with no questions asked.
BTW - when i first got the motor a few months ago, one of the solenoids was stuck, i emailed JJ and 2 days after it was in the mail, no questions asked.

Seems like JJ is trying hard to give the best possible service, i appriciate it.