I discovered these settings by accident, & really don't know much more about it. There's a lot to learn about the DX6i.

I double checked my Panther settings & found the sub trim throttle is set @ +50 versus +60 for the KT. Apparently there are variations between DMDs. There is also a narrow band in the sub trim setting in which both guns will operate; if I move my settings for either tank in either direction, one of the guns will quit working while the other works. The trick is to find the setting at which both will work.