Something I experimented with. I HTed a couple of kitchen knives yesterday, and one developed a kink during the quench. Rather than forge it straight again and re-HT, I decided to try something different.
First I tempered it for 2 hours. Then I used a thick piece of stock, 2 pieces of scrap and a C clamp to bend that kink the other way and tempered it again for an hour and let it cool te room temp. The kink was already a lot less. A second temper cycle clamped like that, and the blade was perfectly straight.
For razors you could try something similar after the first temper cycle.
I also learned that cutting your finger on the side of a fast running 40 grit belt hurts surprisingly little. It just looks gross because it doesn't cut, it gouges. And then there was a lot of black swarf I had to clean out because my finger acted like a belt cleaner. It'll probably take a while to heal too. :(