I've read a bit on caring for shell cordovan the past week, especially after ordering a pair, and have come up with a possible solution for caring of shell cordovan:
I often see reports on the dryness of C&J's shell cordovan and thought that maybe some conditioning would help. I saw that lexol conditioner was actually said by N. Horween to work on shell, so that's one way it may be solved. I also see that beeswax formulated conditioners like Venetian(?) and Saphir leather lotion is said to work well when conditioning shoes. How about warming up a very small (pea sized) amount of Obenauf's HDLP and applying it on the SC shoe? It would make them more water repellent and condition them at the same time, while still having the glow of the shell cordovan? I know this is fully against the Mac method, but my OC of maintaining my shoe hates the thought of not conditioning them. Sorry if I bore or annoy someone with bringing up a topic that's already been beat to death.
I'm pretty sure I've seen Horween say no to Lexol on shell... In fact I think it was followed by multiple exclamation points.