I took a look at the log for 00131. One thing that was very obvious is J3 having very limited range in Rabbit and nothing in Turtle. The range of the controls in Turtle is still too narrow in range. I would suggest opening the ST16 and giving the potentiometers on the sticks, Rate Slider, Pan Knob, and Tilt Slider a good cleaning with a plastic safe electrical contact cleaner. See attachment 41 in Way to Fix Drones Project. Then check them in Hardware Monitor. Ensure they are able to go full scale, center when released, and are not lagging or jittering.
I am perplexed at the hesitancy to descend properly. Looking at this the RS module is not the cause of the troubles. I am suspecting there are issues with the Flight Controller on the aircraft. The barometric sensor is on the bottom side of the F/C and it seems that it or the accelerometers are having issues. I would suggest connecting the aircraft to the GUI to see if it detects any issues with the electronics. Watch the yaw to see if it constantly drifts while connected to the GUI.
I will attach charts from the analysis program later today. I have to merge them in Photoshop and I have stuff to do this AM so I'll elaborate later today.
View attachment 26622
@Dave I do you have the GUI loaded on a PC?
If the Hardware Monitor is showing the sticks and the Rate Slider as having full travel, open the Final Output display by double tapping the Volts icon on the ST16 (the aircraft does NOT have to be on and bound). Place the Rate slider at Rabbit and record the values of the sticks (Ch1 thru Ch4) at full travel in both directions, the tilt slider at both endpoints (Ch7), the Pan Knob at full left and right (Ch8), and Motor Arm/Disarm (Ch1). Make sure J1 and B1 are the only thing that affects Ch1. Repeat with the Rate Slider at Turtle position. Report the results here before taking anymore test flights.