I realized after my first test flight that it would be better to put the pilot on the aileron, rather than rudder, channel, as that channel gets a lot more – and larger – activity. That is, the ailerons move farther, and more often, than the rudder, so I’d see more pilot movement.
I also realized that I didn’t really need the ‘Y’ connector I had so laboriously soldered together from two servo extensions. Instead of splitting the signal from the receiver, I could just program a mix on the radio, itself. Which is what I did, using the aileron channel to drive the flap channel (which this plane doesn’t use). The pilot servo is now plugged directly into the flap channel.
Live and learn.