My 1955 Gillette Red TipMy early to mid 1940's Regent Tech.
The Red Tip with a .026" gap is supposed to be the most aggressive of the US made TTO's.
It is easy to see why your Regent is more efficient.
My 1955 Flare Tip
The .026" gap is the same as my Red Tip, but a slightly milder shave.
My early English Tech
Also a .026" gap, but the most efficient Gillette I have.
With a shim the gap is .032, and feels almost the same as my GC 84-P.
I does seem the English razors are more aggressive than their US made counterparts.