I did not solve the problem up to now. I had 2 S100 and they both died before beeing one second in the air. I had to find a solution very quickly (12 h) and ended up mapping 585 ha with a Canon A495… .
Since I did not need the precision Reach offers for that job I just used Reach for navigation which worked perfectly (with a fix) for 90% of the time.
Now I bought a RX100M2 and I hope my copter and gimbal will carry it.
When I have time later in the year I will try to find a solution for the Canon cameras anyhow since they are nice for a very cheap mapping setup and I have colleagues abroad which would be happy to have such a setup (which is better than most of the Phantoms anyhow).
I think it is better to filter the signal before it reaches the Reach module because I think the M8T only reports the time of the last edge within the epoche. And I think it is very simple to implement a solution with an Arduino which filters the signal.