Jetting has alot to do with your altitude. Removing the snorkle or snorkles (depending on year) will give you some gains , drilling the box even more and a kit like the Freak even more all requireing different jetting. With your current set up I would think about a 130 main 45 pilot would probably also be good.

The bogging could be a fuel filter issue possibly starving for fuel. Or possibly the dreaded tank vent hose. But not limited to that. You may have a vacume leak also possibly indicated by the whitre plugs. However the white plugs don't mean you have a leak it could also just be from lean jetting.

120 and 42 are stock jets there is no way you need to go smaller as these bikes come lean from the factory.

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