By the sounds of it then it’s not just been bad luck.
As I said the slams I had 10-12 years back were indistructable and stuck to surfaces like hot snot. I think i still have a pair of them in the bottom of a shed somewhere I might have to dig out!
I dont really use the shoes for on the hills, I have boots for that, they are mainly used as a casual thing and for walking to and from work.
I have a pair of North Face hedgehogs, they’re ok but soon went to look tatty.
A mate of mine swore by the Non cycling 5:10’s i might track some down and try them.