This was more like what I was trying to get the other week.
Decided to use Litchi, which does an amazing job.
Constant speed. 
Constant camera heading. (See how the power station chimney is totally fixed!
)
Low and moderately fast.
Straight off the SD Card - just trimmed and knocked down to 1080.
Hmmmm - my phone’s video edit (trimming) has introduced a twitch. Frame rates. It’s trimming - no need to change frame rates! #Meh