I keep ending up back here,
you say a well known used razor source?
I am going to ask:
Well known?
or
Reputable?

I would also find a soap you like and stick with it for a bit while you get over the hump so to speak.
You say you have been stropping which is needed, did you do this prior to the first shave?

The first things that come to mind for me are all of the technique issues, Angle, pressure, Prep, good Lather, Stropping......

I know you state you pay attention to the angle but what and or how are you determining it?

If the edge is in question I would be happy to check it out

but I know we have some great people closer to you,

a bit of hands on would set you much farther forward than I can from here.

Pat