The MC-59 should be fine. 1/4 turn clockwise.
MAKE SURE you set BOTH needles back to factory before you do the 1/4 turn on the HighSpeedNeedle!!!
I'm thinking (speculating) the needles may be way too lean right now. But thats all it is, speculation.
Another question for you: When you are starting it, do you hear a metal-to-metal 'PING' sound? I'm thinking if the rod is stretched, you could be banging the piston head into the plug. And are you using the gold washer on your plugs?