I’m shooting a documentary feature film in the UK on my IPhone 16 Pro Max. Are the following specs correct in order to give me the highest quality possible?

4k
24fps
Codec - HEVC H.265 
Color Space - Apple Log HDR. 

I think I’m going to use Black Magic app to control the camera - is it better than using the cam native settings?

I’m using a DJI Osmo mobile 6 gimbal - can I control that on Black Magic too? 

I am using DJI mini wireless mics x 2 - can I set and monitor the levels on Black Magic too or directly on mics or on native settings?

Does setting optimisation to on mean lesser quality?

 Can I transfer all the rushes daily from my iPhone onto 2 x 4TB LaCie Rugged ext drives at the same 4k quality then delete the videos on my iPhone? (I will be shooting around 50 hours worth)

Many thanks for any advice.