Your post caught my eye because you said you have both 7300 and 7100 working well.
My 7300 works perfectly on USB0 but I cannot get RigPi to see my 7100 on USB1. TEST RADIO gives error "Check radio connection and settings".
For 7100: Connectors DATA OFF MOD and DATA MOD are both set to USB and BAUD set to 19200 on both 7100 and RigPi Advanced Radio settings with standard 88h address.
Do you have any suggestions? The 7300 set up very easily and I thought the 7100 would too. :(
Thanks and 73