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Rasmus, it isn't in your best interest to send out O1 for HT. You go camping a couple of times a year? I doubt you'll notice any difference as long as you don't temper the blade back too far. If I remember correctly I had a couple of knives that a file would barely bite into after a temper at 400 degrees for 2 hours. Must have got them good and hard.
My S30V filet knives are very wear resistant and my customers in Florida wanted that. The very first knives I made were from files I tempered back and ground for working on a fishing boat in the 70s. I was tired of constantly having to resharpen my knives from cutting through bones and scales. Those file knives were very hard and held up well. Not too easy to sharpen, but I was a pro at that.
The first filet knife I sold was O1 and the skipper of the boat was impressed by how many fish it filleted without sharpening. That was HT in an oven, so don't be surprised if you don't get a few blades that good too. By the way, O1 does better with a longer soak if you can keep the charcoal from getting too hot. You might try to experiment by getting the steel a bright cherry red and then turn down the air blast a little and try to maintain that color for a few minutes.
Good Luck.
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