I have done a large amount of de-flasking over the years and this is the process that I use.

Get some number two bark,some small shallow pots about 4inch (shallow for me is about 1.5inch) I use clear plastic containers that I get from the deli section of the supermarket with food in them.
Wet the bark and let it sit damp for about 2-3 days to obsorb the moisture.

When you are going to de-flask make-up a solution of fungicide(normal strength according to the manufacturer) I use a systemic form and use water about 68degrees F.

I another container I get some water @ about 68degrees F -this is used to help break the agar and aid its removal from the roots.
As the plants are removed from the agar they are placed in the fungicide solution.When all plant are removed from the agar and they are in the fungicide, I leave them there for about 15 mins.

I then remove the plants from the fungicide and put them into the dampened bark with no more than 8-10 plants around the outside of the pot , burying the roots but keeping the ryszome level or just below the bark.

From there the plants are place in the same growing aera as the mature plants . I do not water the plants.

As I have a misting system that comes on at 7am for 40 seconds each morning, I continue to not water or fertilize for about one week, and from then on they get the same treatment as the established plants.

Good luck on your deflasking and if you get the chance to choose the flask that you purchase - look for onethat has NO fungus or bacterial growth , plenty of live roots visible on the bottom of the flask . Not able to see roots the the flask is not ready to de-flask.