wow that is a big diff, I presume the left and center vert RG convergence was ok?
You may want to check the pots/resistors etc... if its not working right.
Glad to hear you are making progress on it.
maybe even try with out the conv board in (you may have to sub in a resistor 100ohm in the vert circuit if its like an RCA to get the full vert deflection).
Just to see how it looks without edge compensation.