Lachlan, according to Developing by Jacobson & Jacobson,18th edition (revised) page 196, 4 Glycin developers are listed.
One of them is AG8, your chemical list is the same as in the book.
The developer is used undiluted.
Developing times are listed as:- 10 - 12 minutes @ 20ºC
The important charactistic of Glycin developers: Slow and clean working, giving low contrast and has good keeping properties.
I had a pen friend around 30 years ago who used a Glycin developer. Some of the prints he sent to me, of high contrast scenes on FP4, were really well handled. Mind you his technique would have been honed over time.
Mick.