Mapping X-Plane 11 530 to COM2 / NAV 2 with RXP and RSG 650

I recently acquired and installed the RealSimGear 650 and the Reality-XP GNS650 to go with it.   I also have a RealSimGear GNS 530.   I want to use the GTN650 to map to COM1 and NAV1 and the X-Plane 530 to map to COM2 / NAV2.   The 650 works fine on COM1 / NAV1 but the RSG 530 hardware controls the x-plane 430 and the 530 display is essentially static.  It's like the RSG 530 buttons are now mapped to the XP 430.   Any suggesting as to how to get the RSG 530 with XP 530 pop out to function as a true NAV2?  For NAV2 I want both GPS and VLOC to control the second CDI in the X-plane C-172.  

I've tried about everything I can think of.  I'm not an expert on the various X-Plane settings in .ini and other files. 

Thanks in advance.