The 1095 is a shallow hardening steel which may or may not harden sufficiently in warm Canola oil. As far as soaking it goes, it can be but needs good temperature control to keep from forming large amounts of retained austenite, like most hypereuticoid steels. Then you are going to have some carbon loss from the 1095 due to carbon migration and carbon loss from the whole mass of steel due to decarberization from the high welding temperature. Then there's how thin you make the layers which will promote carbon migration. All that determines the final carbon content of the blade.
As far as tempering goes you will have to experiment a bit. I would start at 350° and test the edge then work it up by 25° increments to get it to the spot that I want.
A question, if you have experience with 1084 why don't you use that with the 15N20. The 1084 is a tad more forgiving than 1095.
Doug