I know people are going on the 'bike is too lean tangent' which is highly logical and plausible. But shouldn't EFI systems be able to adjust for it? Also shouldn't a Bosch EFI system work as well if not better than the industry standard, and shouldn't it be easy to achieve with a 600 single, being a fairly simple and well known design?

This is only a theory, but maybe this could be an electronics issue and the spark is too weak? We all know Chinese shops don't adequately trickle charge new batteries overnight, we know that a company like Jialing might have mediocre wiring and that the ignition coil and leads might also be causing the problem. Just a theory to eliminate.