First, Sorry about you grandfather's passing. You really hit the jackpot with razors though. He left you some nice stuff, and you are a real mensch for taking over the tradition.
Strop conditioning? Many people just rub the palm on a strop just before use, and that's it. I have tried this and I find that it warms the strop, softens it and increases draw. I also use Fromm's strop dressing sometimes and I find it to increase the draw of the strop significantly, then for the effect to fade over a couple of weeks. I'm using a Dovo Russian Leather strop.
-----Michael