Align TREX 760X F3C Hover Un-commanded Collective Drop with BD Axon and Jeti DS-24

Testing the Align TREX 760X F3C and having an un-commanded collective drop in the hover. I am running the Bavarian Demon Axon with Jeti DS-24 EX-Bus Serial Connection (REX12). I am running a Head Speed of 1400 rpm and the Head Gain at 45 % and the helicopter is very smooth except for the un-commanded collective drop.
Scorpion Tribunus II 200 Amp ESC with the HKII4530-500kV motor. I am running BK Servos BK-9001HV for the CCPM and BK-9005HV on the tail.
The video is a little long and the collective drop is very subtle, except at the end of video. It happens four times during the video, twice at the start of the video, but the most noticeable is right as the video ends.
Any inputs or thoughts on what might be causing this will be appreciated.

[@oponohou]

Hi , i have an Axon since few days and i begin to setup it...Can you give me your data setup (f3c data , head and tail gyro gain)do you use autolevel to arrive at this marvellous hover ? Great ans thanks..if you have some screen capture i'm interested 😂...

[@KelharDesigns]

Hello, Thank you for the kinds words and comment. I have since switched to FrSKY and I am now using the Sprit GT FBL with FrSKY integration. My latest video of the 760X, I am using that new setup. I unfortunately don't remember all the setting and the Axon unit that was in that helicopter is now sold. I know I used basic F3C settings and I did not adjust much, if any, of the basic settings. I tame down the cyclic rates to equal approximately 4 degrees for the hover and might run 10% expo with the reduced cyclic rates. I do not use auto level or any other functions on the demon when I had it, just the basic FBL functions. I hope that helps and if I can be of any other assistance, please reach out. Take care and talk soon. Jason