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I've gone through similar things with MegaSquirt too. The problem is, is I always tuned when the engine was heat saturated. Then, when it was "luke warm", it would run not so good.
So last week, I ran a 30 minute data log starting once the engine got "luke warm" up to full hot. Then, I let the auto tuning software generate a,new fuel map. It has worked great so far in different varying temp ranges.
If you really have transient issues from one power cycle to the next, this won't fix it. But if it's due to large temp swings an air-cooled engine endures, this may help....
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