Michael, you're not using a 3-D heli mix in the Tx by any chance, are you?
So far I've been using an XJT module with an MPX Evo Tx which is set up as RPTY (and that's what it sends when using a CPPM Rx). Using an SBus Rx (or maybe binding in D16 mode?) switches it to TRPY order. I just broke down and ordered a Taranis last night...
-Max