I hate to hear about your Heli Treff, sorry it gave you so many issues.
I understand about getting to the last thread with something and canning it, I have done it myself after stomping it in to little tiny pieces...
I have 3gx 3.0 on my 450DFC and my 500 FBL and no issues, I'm about to build a 550 FBL with the same on it, have the kit just needs to be assembled.
I don't leave them spooled up on the ground tho, I get to speed and lift.
I am fine with 3.0 and don't plan on changing it.