I actually did some VSC this weekend to get some brown cream off then as well, and put them in the sun for a couple hours. I almost feel like the toe and vamp darkened rather than lightened but probably just my imagination. I don't think I overdid it with the VSC.
Also, as much as I like the look of my Guarded Goods flat waxed cotton laces, they are kind of a pain to use on the Lindricks and don't allow me to tighten them as easily. Will probably revert to the factory round laces.
I put some Saphir medaille d'Or Renovateur and it works very well to make it shine.