when i repot for the final time i put the smaller pot with the plant in it into the big pot, top it up with soil and pat it down, then carefully remove the smaller pot, leaving the mould of it in the soil. then i sprinkle a teaspoon full of myco powder in the bottom and drop the plant into the hole (without the pot!).
i use this method as well and it does work PERFECT!( even when transplanting into the ground) i have had more than a few people who were just flat out amazed how smart it is, and that they never would have thought of it.
those talking about flushing......don't forget a proper cure. it is a MUST imo to bring out the full flavors and smoothness of your buds.