Maybe your problem is lubrication?
You are not a noobe,so I suppose you don't have that problem,but I couldn't resist asking.......
I myself have very thick hair,where it still grows on the majority of my head,except for the front,as I'm partially Yemenite by origin,so I can understand your problem with running blades off.
I can use a Mach3 for about a week.(and only 3 days with a Mach3 Turbo blade-don't ask me why is that)
Maybe you should try the Mach3 version......
See ya,
Yohai.