Hello Mark,
I am glad you had good success with the regulators.
The last regulator that I threw out was on a 1920 Studebaker, 289 cu in., single barrel Stromberg.
On heavy load, this car would always lean out. A problem we chased for a while.
We had the regulator set to approx. 2 lbs. to accommodate the needle in the Stromberg. This is still twice the head of the original vacuum tank.
Long story short, switched to vacuum tank twenty years ago and never ran better.
My only point was not to create a problem while fixing one.
Dennis