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There's an easy solution to this. Just send it out :-)

Weight, if it's a big razor. I've got a quarter hollow 8/8 W&B that's like slinging a hatchet around my face. Doesn't seem to notice the whiskers are even there, down side is I'm not sure it would...

TI still makes half-hollow razors, they're listed at classicshaving (one of them is here).

Also, John Crowley has several NOS quarter hollow blades, here's a link to one of them.

Also,...

It's not so much a matter of brand as it is grind. Wedges, quarter hollows, half hollows, and 3/4 hollows are all very stiff and heavy for their size. Some full hollows are still quite stiff, but...

Sharpness, stiffness, and weight all matter if you have a stiff beard. Size doesn't directly matter as far as I can tell, except that larger razors tend to weigh more and be somewhat stiffer.
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