I don't understand what SimbleeCOM is so I am hesitant to go down that rabbit hole.
I am using bone stock RFdigital dev boards, 2 Simblee boards (one is the large one with all pins), 2 RFduino boards and 2 USB serial converter boards.
SimbleeCOM is a RF Digital propriatary modification of BLE protocol that only works on the Simlbee firmware and not supported on RFduino firmware or other BLE devices. It is not applicable to a mixed Simblee/RFduino/Competitor BLE environment, nor a GZLL project per se.
So whatever is going on with GZLL Simblee vs RFduino needs to be figured out.