Great report... sounds like a winner for sure.
I flew the Seagull Edge 540 again today after moving the CG forward. I started at 3 5/8 with it having called for 3 3/4. Today's flight was at 3 1/4 and it was much better having a less sensitive elevator and far less ballooning when slowing for landing. The CG calculator showed 3" even for a 15% static margin and I'll test it there to see if it completely rids the ballooning problem while leaving adequate elevator authority. I don't do 3D and good landing glide slope is my priority.
The viton I bought from Horizon has now stayed attached to the bison nipple for a half dozen or more flights whereas that that came with the motor, split in one minute of running on the bench.
The muffler did loosen from the engine slightly after the forth flight and was put back on without the gasket using copper RTV and blue locktight on the threads. It is still tight after the two flights today.
We saw about five minutes of sun today... but it didn't rain.... smile.