That second picture is a joke. That's what you do if making a Christmas present for someone. Lace as in upper pic.

Proofide is also a wax-based product, but has more oils in it than sno-seal. I usually only Proofide the under side of my saddles once, and the tops only once a year, if that. You say you occasionally ride in the rain. If your saddles get wet, I'm not sure I'd get back on them until thoroughly dry. Could riding them while wet be causing your sagging problems?