The plug looks good, I would leave the 210 in it unless it runs better with the 200. A bit rich will actually help cool the engine. As far as which jet to do first it will be the main jet. Reason why is the pilot jet delivers the fuel at idle, the main jet does not. From idle to about 1/3 throttle you are primarily pilot jet. At around 1/3 throttle the main jet starts to come in and the pilot jets drops out. Between 1/2 and 3/4 throttle you will be entirely main jet and the pilot is out of the picture until you decelerate. By doing the main jet first you are making sure you don't have a lean mixture at WOT. Once the main jet is dialed in you will now look at the pilot jet. If the pilot jet is too small you will have a bog, hickup or miss during the pilot main transition. If you do the pilot jet first it may run great but when you dial in the main jet and it shows a lean mix you will fatten the main jet. Now your transition of pilot to main will be off and have a period of rich mix during the transition period. It just makes it much easier and less work doing the main jet first.
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