1. Brought the timing down from 34 total to 32 total 2. Upped the primary jets 4 sizes 3. increased the power valve from 2.5 to 3.5 4. Added 5 gallons E85 ( 110 Octane )to 10 gallons of 91 octane 5. went up 2 heat ranges on my plugs
Comment on the E85 - it is high octane but lower energy per gallon. Adding it to the fuel mix effectivly leans out the mixture. Even with the bigger jets you may have leaned it out overall with the E85. Two or three gallons of 110 race gas added to pump premium should help without leaning the mixture. That and reading the plugs and likley going to a colder plug should quiet it down.
Also, ping at half throttle suggests the timing curve is too aggressive. A slow mechanical advance with full advance delayed to 3000 RPM may help.
The other benefit of adding the race gas is it should run without hurting itself while you get the plugs, timing and mixture dialed in.
