I see there is a few problems here.
First, you have to many step to before you edit.
Really you should not save your raw as Jpeg !
You are going From 14bit raw to 8bit jpeg then 10bit 422 HQ mov.
By doing this workflow you will introduce Artifact, Banding, etc.....
I don't have Lightroom, i use Adobe After Effects CC or Photoshop CC
If you are using Lightroom i would Export as a 16bit Tiff.
Import in to Premiere Pro as a tiff image sequences, or if you like
to use video files, import your sequences in to adobe media encoder and
export to ProRes 4444. it make no sense to use a 422 codec when they both have the same bandwidth.
quick times 7 has problems with gamma shift etc.. try no to use that .
When you are using ISO's with numbers like 160, 320, make sure there are the Magic Lantern digital ISO's
or use the native analog ISO's eg. 100, 200, 300, all the way up to 1600 .
the non magic lantern digital ISO's(160,320 etc.) which are not very clean.
So it would be better to use ND filter at 200 ISO then to use 160 ISO that has digital gain.
Remember you have at least 11 to 12 Stops of Dynamic Range to play with in post.
I hope i didn't make things more confusing, you are on the right track just need to
work with raw more