I have had the same problems with my bike and welded a 1/8" piece of plate on it and then it broke. I later cut off the entire bracket and then made a bracket that wrapped around the frame under the coil with a piece of rubber under it with the isolator mount. It has not broke thus far and really does a good job at isolating the vibration from the pipe to the frame.
Thank you soo much for the pics!
So... if I'm reading this paragraph right... what I'm looking at it some sorta metal strap piece, layered with a rubber strap piece underneath of it (in-between the metal of the frame and the metal of the strap)... bent around the frame backbone there?
so... you used the same 1/8" plate metal (mild steel I assume?) for this as well?