Thanks to all your help I was able to fine tune the big quad today. I did some more reading once I figured out how to set the gear switch to ch5 and realized there were a few problems that needed to be corrected.
Several features on the Tx are not compatible fully with the IFLY FC;
Dual rates have to be set so default condition is high rate. Setting the other way prevents turning on and off the quad by remote as the FC looks for full rudder at near zero throttle for ignition switch inputs. You can't turn on the Turnigy 9x Tx with any switch out of default position without getting an error message.
The IFLY FC looks for flight mode information on the Gear channel and requires a two or three position stepped input of 0-10%, 50-60% (optional), and 90-100%. I suppose you could use a pot for this but this results in an undefined state in between the designated ranges. To use a 2pos switch like the 9x Tx has for Gear you set 0-10 and 50-60 ranges to the same drop down flight option.
The IFLY-4 has three flight modes;
Manual
Auto-balance
Auto-balance + altitude hold
In the altitude mode the throttle input is disabled and becomes a three state switch. 0-40% descends, 40-60% holds, 60-100% climbs.
This means that dual rates, hover throttle trim pot, fail safe, and throttle hold/cut functions on the 9X are only valid in Manual and Auto-Balance modes only.
Likewise, the IFLY FC has a firmware adjustable throttle idle speed that renders Throttle Cut inoperable as only a full rudder at low throttle will disengage motors completely. You can still use that switch for throttle hold but it doesn't serve much purpose this way.
If the throttle idle speed is adjusted below "high" in the firmware then throttle response below 20% stick is reduced drastically.
That all being said I'm quite happy with the quad and can't wait to take her out for a real flight soon!!
Edit; also I still can't find any info on the 3pos toggle switch marked Aux 3 F Mod on the Turnigy 9x Tx. It appears to have zero effect in helicopter mode though as confirmed by watching all outputs and inputs on the five channels while testing every stick and switch.
I have the Tx's craft type set to Heli-1 as the manual states this is independent aileron, elevator, and rudder action. It would appear that the four Heli modes in the Tx firmware are swashplate designations. This is irrelevant for a multi rotor but I'm not sure what, if any, effect the other modes will have on performance.
Sent from my iPhone using Tapatalk