Here's where it's a little tricky. You can loose some power, or pull, buy getting a littlle rich. Not enough to make it sputter, not enough that it boggs like when lean, just a tad to rich. Play with the needle like you said and see what happens. When you richened the main you allowed more fuel through the orfice that the needle can use. Maybe it's just a tad to much. You'll have to play with the needle to find out.