Hi, you need to figure out if the blurriness is from "motion" blur or "out of focus" blur. Can you post one best and one worst image?
In EXIF info of your photos you can see exposure settings, it will tell you why was the photo bad.
Some advice:
-set white balance to cloudy/sun/custom, do no use auto
-if autofocus does not work well, set manual focus and try to keep same height, or refocus manually if needed during flight when height from ground will changed.
-choice shooting mode to aperture priority and set: ISO 100, lowest aperture number and check what is the resulting shutter speed. If it is 1/200s it should be enough for stable not fast flight...it depends also on flight altitude. If the resulting speed is way higher(1/500s...1/800s) you can try increase aperture number to 4 / 4,5 / 5.6 and check if shutter speed is at least 1/200s.
Magic behind lens aperture:
Low aperture values produces more sharper images in the middle, but can cause unwanted chromatic aberation effect on sides/edges, higher values produces less sharper images, but without chromatic aberation. Yout need to find some sweetspot for your lens where you will be satisfied in terms image quality, blurriness/sharpness. Maybe final aperture value will force you to increase ISO, because resulting shutter speed will be not enough for motion blur less images......playing with these 3 exposure parameters is important for photogrammetry.
Fixing this issues in post production does not make much sense.