If I swam in that position, I would get sooo much water up my nose, I'd think I was waterboarded! Some great footage you have managed to capture there, well done. I'm surprised that you were able to post to YouTube with that copyrighted Movie...
The Drones PID would correct that. Drones really don't fly out of balance, The PID corrects it. example if you put a small weight on one side of the drone the PID would notice and the drone would still fly straight. The PID will run the motors on...
I have one similar to this....
https://a.co/d/4aCi8zB
I find it is good for me if the sun isn't shining directly on the SC's screen....the rubberized material also protects the exterior of the SC.
Batteries should not be charged when they are hot.
And then follow these tips for when and how often to recharge:
https://www.mavichelp.com/tips/how-to-maintain-and-store-your-dji-mavic-batteries.43
Despite the warnings that we hear every time, about what might happen, it had no effect, just as it always does.
UAV forecast might tell you that the Kp index was high, but after seeing these warnings for 10 years and still not a single drone...