Hi Billy,
The #6 wire that you have running to the shop is rated for 60 Amps. For 100 Amps you will need to change the wire to a #2 AL, however due to the 200' distance you will experience a significant voltage drop. In order to compensate for this you will need to use a minimum of #1 AL, AWG Quadplex overhead service wire.
The size and number of circuit breakers in the shop are fine for this size overhead service.
Don't forget that 30 Amp breakers protect #10 wire, make sure that all of the wiring in the shop is #10 wire
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