I was somewhat concerned about the 3/8" line but it is only about 50' worth and Ted didn't seem concerned in our initial conversation before I ordered everything.
I don't mind running the extra diffusers I already have.
My thought now is once the pond is back in shape, I can run the 2 Vertex diffusers in the 12' section and one of the old diffusers in the shallow area where we swim to help keep that area nice on the bottom.
I can them run my other old diffuser on the other side of the pond at 3' for the winter and create a good boil to keep the ice open without having to bleed off air.
Probably overkill but don't see any reason not to go this route unless I am missing something.