Greetings
I'm a little surprised that the blades are doing so well, I don't seem to be able to keep an Autostrop blade going this well, probably because you are realistically confined to the automatic stropper (unless you fit a temporary spine) and I am not very fond of any autostropping device that I have tried yet; including the Magnus Stropper included with some of the Heljestrand sets, it's just not possible to properly control the pressure and it's certainly not possible to use a super light touch!
I have found like you that I can't seem to keep the blades going on plain leather alone, you do need to use some sort of abrasive paste even if not for every shave.
Regards
Dick.