Nothing to co with the toughness of the drone. what did you expect hitting branches that thick. Flying that fast with out enough practice, (sorry) it won't be your only loss unless you get used to anticipating whats ahead at that speed.
Well, I used a 120mm refractor on a Losmandy G11 Gemini2 mount and a ZWO ASI 2600MC camera. I guided with PHD2 on the comet I believe on this shot for two min. I know this isn't drone stuff, but there you go.