I've run about 3 tanks through it since I got it back. It started right up on the 4'th flip and there was not much much residue so I guess Horizon did break it in! I am still treating it like a new engine though.
The tuning was right on and it sounded good and flew well but it's not quite where it was before the problem occurred but it is slowly getting better just like before. Time will tell but I'm hoping it was just a defective crank that caused the issues