Okay, I checked silver moogle belt and it does not, in fact, affect max HP calculation for latent, despite what was posted on that JP site. I also verified the L ring / R ring thing, and it is true. I'll see if I can't borrow an HP+ earring again later on tonight or something for that one.
Anyhow, the moogle belt not counting brings more regularity back into what I'd posted above. Basically everything counts except Back, R. Ring, Convert gear, HP+% gear, and Food. Also possibly R. Ear and Range since those are untested.
XI Wiki

