The motors on these little saws are notoriously weak --- and since your description of blade align/adjust/blade choice sounds like it was done properly the next likely candidate is the motor. There have been a few scattered instances of the little gear box binding up, but much less likely than the motor. Is it new? Enco is great with customer support...
A note of caution: if you have to replace it, be aware of the counter-clockwise rotation (dont ask why I say this
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If everything seems to be going well, you have obviously overlooked something........