I'm confused. I thought if your spark plug is white you're too rich and if it's black you're too lean.
By "raising the needle clip" is that closer to the rounded off end at the top or closer to the pointy edge?
So when you "raised the c-clip" you were making it richer?
Also I should note, I'm only getting about 60mpg. I weigh 220 and my cruiser bike is on the heavy side.