By adding more oil you are effectively leaning the fuel mixture out. More oil= less gas= lean mixture. That is why the bike seems lean. Take out the gas/oil mix that you have in there with the extra oil and go back to the original mix. Then I would either move the needle to the 3rd clip and try it, or install one size larger main jet and see if this solves the issue. Also try turning the air screw in a bit to make the bike a bit more rich on the bottom.
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