Since you use DVR, the best thing you can do is subscribe to Darren Mostyn on YouTube. Here is the DEFINITIVE way to process DLog-M using Resolve. He is talking about the Osmo but this applies to all DJI drones that use DLog-M
Hope this helps!
This is a known issue with the Mavic. 60fps is simply not usable. A YouTube search will show a lot of similar examples. This issue is not fixable in firmware. It is a limitation of the chipset used by the Mavic.
Jim