Rail (750Wh) Trek Rail UDH issues

[Matuk72]

So my rear mech decided to smash into my frame destroying itself and taking a nice chunk out of the frame. UDH was fine so I’d say the design isn’t that great If it’s going to cause so much damage rather than break a £20 item.
My problem is though, when trying to torque up to the specified 25nm I’m destroying the threads and the UDH are breaking in half. I’ve now broken 2 trying to torque up to what trek say should be 25nm.

Any one else had this problem?

thanks in advance for any advice.