I also brought the gap from .011 thousands of a inch to .007" and what a beauty sweet spot that is(midrange).I think the older 1920's blades where not as sharp possibly so they gave more gap?? Changing the gap was not a big deal because the brass is malleable.
Assume you are adjusting the gap by bending the "teeth/comb" up toward the stops/blade and checking with a feeler gauge? Also, saw a thread (can't remember the OP or if it was on B&B or Shave Den) speaking to bending the (I believe) the lever in the back (especially for the B series) to increase the guard travel and minimize the impact of the (reported to be shorter) de-spined GEM PTFEs versus the NOS blades--however the accompanying photos were not available/wouldn't load. Didn't know if you've seen that thread or know about it and or have photos... Been doing too much reading lately.