Brooks has made saddles for 129 years. With very little change in their saddle line. That alone should say something.
How many other bike co. can say that?
Keeping that in mind, I use proofhide the way brooks tells me to. I think in over 100 years they may know more than the posters on BF.
So, NO heating up the saddle, NO wetting the saddle, NO other kind of oils, or tanners. Just proofhide and butt. Seems to work pretty well.