Autotune on big X8 unexpect behavior

ArduCopter Copter 3.5
1

I use position hold auto-tune with my X8 22" props in Roll axis everything went fine and the auto-tune is done
before landing and still in autotune mode it hover really good ( very distinguishable from before tuning using stock PID) then I land and check the PID value, see that I got a new set of PID then take off again in Loiter mode
and the drone is not stable anymore very twitchy. I did the autotune again fly really good after autotune landed got new set of PID, take off and get twitchy again.

I havn’t lower the pitch/roll filter to 10Hz and also did not reduce the aggressivity. which is what I will try next

but how come my drone fly really good right after tuning? I thought it is because of the new set of PID that cause it but after landed the magic spell has gone are there any other parameter change during autotuning?

2

Autotuned parameters are saved only after you landed in autotune mode and disarmed.

DId you switched of autotune after it finished to check new params ? Or stayed in autotune mode and landed ?

3

I stay in autotune mode and landed

4

Then new values were applied after the disarm. They were obviously too large.
Decrease filter to 10Hz, and agressivity to 0.075 then try again.

5

I plan to do that but was raining today. attahched are log file from the autotune session
https://drive.google.com/file/d/1-u07kLpplS1a98UuZbufpu8T4LAq69pB/view?usp=sharing