"any tips for a good heat treat hardness using just a torch for heat?"
O1 needs between 1450 and 1500 degrees of heat. I like to soak for about 15 minutes or so. When O1 gets to 1500 degrees it is glowing red, it is also non magnetic. Check it with a magnet and when the magnet does not stick, it has reached it's "critical temperature". Immerse in oil that is at least 70 degrees ferenheit. Heat treating with a torch can be tricky, but with practice it gets fairly easy.
That's about it...there are numerous sources for heat treat information on the web.