I'm with Timmy, I use water with a few drops of Dawn soap stirred in as a lube, and let em soak till the bubbles stop. If bubbles are still coming up then you may have dry areas, and when the bubbles stop, water is no longer being absorbed so why soak further?
I haven't tried to deal with TSProf directly, but Konstantin at Gritomatic has always been top notch for me. Bought my Hapstone M2 and various product for it and he's always been very cool to deal with and quick on response.
Can’t get their website to come up right now, but all their knives are built to those quality standards. I saw a video of him doing similar to a field knife with minimal scaring so a behemoth? Hell yeah. Although I’ll never try it with mine though…..