. . . So come on let me tap in to this font of experience...
I've used E41 Monokey panniers and E450 top box on a wingrack fitted to an FZS600 - toured heavily loaded without issues.
Not got around to getting a fitting kit for my 1000 but ithe wingrack is a very sturdy arrangement.
I've got a standard givi top box rack on the 1000 at present for the topbox and the alternative is to add the pannier rails to this rack. Probably not as solid as the wingrack but I wouldn't have any qualms going this route.
I think all the quoted weight limitations are very conservative - just normal a**e covering if you ask me.