I havent been treated by Dr S but have changed FS for a refreshing approach to my fertility treatment. I would look into seeing another FS with in your treatment group so embies wont have to be transfered I got a quote to move mine..it had to go infront of the fertility board for approval and then a fee of $600 and that was just local to transfer a few years ago, they advised to use up the FET's. But due to you having so many I would look at finding maybe a newish FS that may find working with Dr S a great opportunity to learn other aspects.
I'd do a ring around and see what kind of response you get, it would be extremely stressful to go for transfers interstate..but you do what you have to do
Good luck