Insta Reel Export Settings

Codec H264

Framerate 30 fps

Resolution 640 x 1136 (apparently this how Insta Plays them out, not even 1080 x 1920)

Maximum Render Quality

Bitrate VBR / 2 Pass

Target Rate 2 MB

Max Rate 3 MB

Codec AAC

Samplerate 48000 Hz

Channel Stereo

Bitrate 320

To assure the least amount of Compressing from the Plattform itself,
since they make a terrible Job, using their own compression.