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I got 91 octane in it best I can find for it as they dont sell 93 octane here.
Are you getting it from Shell? If so, stop. I chased this same problem you describe. Switching fuel from Shell gas made the biggest improvement, as troubleshooting and adjusting jetting is next to impossible if the fuel is no bueno or even not consistently used to tune and run on. Also check your hot start cable at carb for good seal and that it closes all the way, especially when turning the handle bars.
 

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I'd loose the K&N and get 2 less expensive filters and keep one in a baggie pre-oiled. K&N works ok when your on-road, sucking clean air, and the engine has 24 to 48 valves. Not so much on the 4 valve single with heavy dirt, sand, grit, etc. coming in. I know that is not what you had asked about, but it will definitely increase the life of the valves, valve seats, springs and keep you from having to re-shim as often.
 
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