Ron, I'm very familiar with the work you mentioned, except I don't know Ektaprint Type II stabilizer. Do you have a patent number or name of compounds used in this final bath? Does it also improve the image stability of modern papers with antioxidants incorporated in the emulsion layers, or does it work on a different mechanism?
Anyway, the main reason I brought these up is really to make a point that there's really not much point in making baryta color paper. A lot of writers from 1990s criticized photo manufacturers to make more profit from RC than baryta, saving silver from emulsions, etc. and a lot of people seem to believe that those criticisms are valid. It's always hard to fight against common misconceptions but this is the time to do so.