Hi!

This is my first post here on SRP.
I've got question someone may have encountered, or maybe somebody has insight.

A little background:
I've been shaving with straights for five or six years. Until recently, I've only used one razor: a Dianne No. 21 pictured below:



I picked this razor up to start with for $2.99. Blades were $2.00 for 5 blade inserts at a local cutlery in Oakland, CA. Obviously, its a disposable, but it was a cheap alternative to modern multi-blade safety razors.

I recently picked up a few "real" blades. One is a Henckles Twin Works, 5/8" spike, the other is a Barber's Pet 5/8" spike, purchased from our very own Stimpy (thanks man!). Both of these blades are full hollow ground, and sharp as the dickens.
However! I injured my hand a few days ago, and couldn't do the daily shave, so I had a bit of growth. Started my shave with my Barber's Pet, but the blade was pulling a LOT, so I figured I'd give the Dianne a shot. WOW.
That razor brought my face to forehead smooth.

I don't believe any of the blades to be notably sharper than the others, and the only variable I've cited in the equation is stiffness of the blade. Both the Henckles and Barber's Pet are full hollow ground and have a little flex to em. The Diane is stiff as a corpse and does not bend at all.

I guess the question here is: does the grind of the blade affect the quality of the shave? Could my technique be poor, or is there different technique for different grinds/razors?

Any insight and/or experience would be warmly welcomed. Today I got the shave I've been chasing, and I'd love to maintain this!