Have you tried Astra or Voskhod blades? They're 2 of my favorites.
If you get lucky enough to find some old Gillette Spoiler blades, you'll understand why they're called that.
I shaved for 3 months straight with a single Spoiler blade, before it needed to be changed.
I normally get between 3 and 8 shaves per blade, depending on the blade.
Those old Gillettes are fantastic razors. Especially the Super Speeds.