Well so much for picking up cheap 115s
Yes the 3 needle solves the intake issues. So does changing the reed block airflow.
The next problems to solve are;
1. Lower the intake port across from the exhaust so the lower ring doesn't wear into the bridge.
2. Don't remove the flashing in the ports by hand. 3 of 6 cylinders I have, have grooves caused by dremels slipping.
3. Too much back pressure/high rpm causes exhaust gasses to be pressed back into the crankcase. Perhaps mainly from the rear intake port being positioned to high in the cylinder.

I'm not worried about Keith. Anyone with his smarts and ambition doesn't stay down long. More than likely if he had more working capitol he would still be in business. Nothing wrong with trying and failing. Anyone who managed to buy a 3W106cs while they were on sale for $1195.00 can thank Keith.