I have been playing with settings and reasons why shoot what settings too. First identify most important item, and fix a little at a time, to keep a handle on it.
I find that the faster shutter speeds can leave the video too crisp and even choppy. I like to slow things down too. I find the slower i move the drone is better, so i can keep my shutter speed slower to have video look smoother. So I'll use 4K settings at 24-30 fps,,,,and set video shutter at 1/60 max. I can still slow video by up to 50%, but slow movement of drone, like using a tripod. Note, this is not good if taking screen captures in premier for a single shot. I will have separate settings if I'm taking pics. Higher shutter speed is better for stills, but take note of aperture. Landscapes are different than close ups, or a particular subject. Good luck....Premier has different workspaces for editing. They have a "color" section similar to photoshop which I love, experiment with curves and stuff.