I use Nuage, King of Shaves Blue, and have also repurposed Holland and Barrett Vitamin E oil. KoS Green worked, but was thicker and more sticky than ideal.I used to use pre-shave oil. A fellow contributor to this fine forum from the UK uses the first one I tried - Nuage - and then I moved on to King of Shaves
Part of my solution to bad skin in 2018 was ditching cartridges and disposables. I was hoping to get on better with a DE and lathered shaving soap.
Returning to DE worked brilliantly; the soap bit, not so much. I get irritation from the locally available ones and Arko, probably from alkali, and was reluctant to gamble on the high-end ones.
I use a hot washcloth prep for hydration, then a preshave oil, and apply canned foam over it. I can shave daily with this setup, get zero irritation, and my skin is in great shape.
There probably is a shaving soap out there with my name on it, but finding it isn't urgent any more.