Stock 2HP Magnum Tuning issues

john cervini /
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1980 MK2 With the 2hp za50. Stock bing 12/323 carb. 60 main jet. New pucks. 2nd speed clutch not flipped. Stock airbox and exhaust. I have cleaned and gapped the points, greased the cam lobe and adjusted timing. My stator plate was all the way to the right as seen in the picture. My issue is that it revs up quickly and seems like first is slipping alot. Gets up to 15mph and won't shift unless I blip shift and it four strokes before it shifts. Tops out at 23. It just spins the clutch trying to get up my driveway too. Clutch pads look perfect. The only way I can get it to not 4 stroke is with the air filter screen removed. The needle was initially on the 3rd notch down. I've tried bringing it up each notch. Currently at the top with no improvement. Any ideas?

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