If it is very hot out, hotter than when you normally ride, the bike is loading up with fuel at the lower rpm range when you are trail riding. When you go to "get on it", the engine tries to burn all of that excess fuel at once. This is when it cannot clean itself out quickly.
The K in CEK is a very rich straight diameter, one step richer than even the stock needle diameter.
If you like the C taper, try going to a CEM, CEN, or even a CEP diameter. The larger diameter should keep it from loading up in the lower throttle range.
I would start with a CEP, 38 pilot, 165 main if you are that high up.
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'10 EC300 -- very happy 
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