Thanks for the reply.
Indeed, yeah. The first time I bought SE blades they were not the PTFE blades. That would be ten years ago now, at least. I think it was because someone on the big forums said "The scraper blades are the same, you just need to pass them through cork" or something stupid like that. At the time forums seemed to win over common sense.
Well, that lasted one stroke of one pass and I immediately got the proper ones which, as I said, I just cannot seem to get along with (Wayne said something similar, I think).
I've got dozens of the old thick spine ones, which Billy taught me to sharpen, and they suit me fine, but wonder if anyone else makes them still, for shaving (in the way that Feather - oddly - make auto-stopr blades, for example).