I only have one shave with it, but I kept falling into the injector angle (head angle about 5-10 degrees off the flush with the skin) instead of totally flush with the skin. I think I was trying to feel the blade, which these razors do not need to be efficient.
I think this a common thing for people too do. We get use to feeling something while we shave and when we dont feel it, we overcompensate so that we can. The result is usually a poor post shave feel at best.
Stirling soaps I dont really have any issue with and use them often myself. Its been a while since I broke a lather with a Stirling soap, but it took considerable water and I dont generally load heavily so that can make it even more sensitive.
One thing I've always liked about Stirling is the slickness. It needs to be very wet to destroy the slickness. Its not Tabac slick, but its pretty good.
Cushion on the other hand I can lose completely very easily with Stirling, less easily with Tabac, but when it gets to that point, Tabac is the slicker of the two.