Shooting a broadcast documentary on IPhone - tech advice much needed

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.