I looked at the Peter Dahl site - they seem to specializw in large iron core transformers. What is needed is someone who at least knows about ferrite core transformers for switched-mode power supplies.
ther is some tutorial material at
http://repairfaq.ece.drexel.edu/sam/flytest.htm
that explains that a fflyback uses a controlled air gap so that energy is stored in the inductance, whereas a typical non-flyback transformer is transfering energy continuously and not trying to store it.