Kevin,
On my SM 1/7.75 F-4 I’m flying Mercury SRS (I am fly Competition SR2 with iSat gyro in my 1/5 SM F-16) I set my gains manually with both gyro systems, rather then using the Assistant. With ailerons, rudder, and elevator with large deflection, transmitter settings don’t matter because of rigging of servo arms. The F-4 Ailerons = 45% gain, Elevator = 40% gain, Rudder = 45% gain.
I haven’t flown an F-100. But warbird jets require higher gain than sports jets. On any jet that I maiden, I start at 25% on all controls. After clean trimming, I turn gyro on to further trim flap settings. IF I get any gyro wobble, I turn gyro off, reduce power and speed, then turn gyro back on. If continued wobble, turn off and land. I’ve never had any issues with any jet at 25%. And if I was doing the maiden on the F100, I would start at 25% and gradually increase by 5% each flight, one axis at a time.
I thought you and I have chatted about the F-4 over the past couple years? You can watch both my F-4 and F-16 with iSat on YouTube with same s/n: rcflyerdan. The F-16 I only have two flights, and not fully trimmed.
Best wishes! Dan
PS: These are settings in the Mercury, the transmitter switch is 3 positions of +100-0- -100. But I usually turn attitude hold to 0. So switch is: +100-0-0.