I would like to see the flightlogs from these test flights.All is complete, the j3 would not center, center is -5, split the st16 cases, lubed all 4 pots, reassenled and did the hdwe check and now +5, still steady beeps on startup, did the secret strtup, 3 quick taps, did the gymbal calibration and all lights green, no beeps on startup. model starts, responds well, 19 sats on both units. Landing gear operation good, landing is succesful, a little slower than usual but good landing. Ascend again movement is good and accurate, go to 100 feet and begin descent, at approx 15 feet alt it slows down, descends very slowly, rise rapidly to 40 feet and begin descent, good steady drop to 15 feet again and all slows down , maybe 1 foot per second, at approx 2 feet it starts to slowly drift, maybe a gust of wind, but slides to a landing. End of test flight. Complete shutdown, restart, and rise to 50 feet, cycle gear, descend to 15 feet and full slow descent but completes to ground at the slow rate. I think I know why some people hand catch these things. SO, all FW updated, pots lubed all good except for this 15 foot slowdown, any suggestions greatly appreciated Dave I
Another thing to check is the flow camera on the bottom of the RS module as well as the sonic sensors there too. Use a Q-tip or lens cleaning cloth to wipe the flow camera lens. For the sonic sensors, make sure the covers are not pushed in or debris inside.

The sonic sensors are highlighted in green and the flow camera is highlighted in magenta.
Also make sure the fan is running. If the RS is overheating it will not function properly. The fan is a replaceable item.