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"  Do I really need DC blocking Capacitor in the Primary?  "

If your control can guarantee zero volt seconds average on the transformer primary  -  then you don't

Properly done peak current mode on the pri side can give this sort of control if done well

If you don't have this   -  then a blocking cap may well be a good idea  -  we can't see how good or bad your control circuit is,  we can't see how you have made your transformer  -  we can't see how symmetric your circuit is . . .