D -
Sounds pretty good. Most people don't take the time to quarantine so you are way ahead. I admit I am guilty of it even though I paid for a 10g tank, power filter, and such to set up a quarantine tank! It just takes patience.
The only thing I would have a question on is the Methylene Blue. I have never used it before, so I can't tell you if it is good or bad to use. I read that it should only be used in a quarantine/hospital tank. It sounds as though a simple dip in it may not be that effective. I think a freshwater (RO/DI) dip will be fine prior to placing in the quarantine tank and prior to placing in your main tank.

Hopefully a few others can chime in with their methods. Hang in there, sounds like you are on the right track!