Do you mean frontal overlap because of the image frequency? I think Metashape recommends 80/60% frontal/side overlap. I would go for more than 65% side overlap.
I think it would be a miracle if flying at 170m and 10m/s with a Phantom can result in an accuracy higher than 2 px. I would be very interested to see examples.
If you want to map with a Phantom I would have a look at the Ashot solution.
If you work with LEDs and photoresistors: have you found my timemark time machine?
