@ Ray - YEs, you are absolutely right. I suspect that there might be other problems with the produced grexes. As we all know, any given cross has a percentage of total dogs. That may be the case here, with most of the plants from the hybrid being total crap. Who would want to breed with that stuff?
I WOULD! I have long theorized that there are some plants resulting from every cross that are fertile, but they may not be award winners (they may not even be beautiful). The only way to pass on these genes in any combination is to use what breeds.
I agree that using these hybrids is a worthwhile pursuit. The flowers, when they are good, are fantastic!!! A large percentage of the delenatii x Barbata hybrids are awarded. The flowers are shocking pink, with all of the caretenoid and flavanoid pigments being suppressed, and the anthocyanins being particularly dominant. And all of this in a more vigorous plant that requires the less demanding growing regimen of a Barbata Paph!
The best you can do is use it over and over again in every possibility you can think of. I would start first with other Barbatas, particularly the vinis based on the idea that when it comes to anthocyanins, more is better! I would also try to breed back to the Parvis, especially anything with micranthum in it (again, more anthocyanin is better). When travelling outside of these two sections, I would go to the Brachys, especially bellatulum or niveum, or any hybrid that happens to breed. With section Paphiopedilum, I would consider any pink or white complex. This has been tried, and to some degree has been successful. Cochlos are a toss-up, though I suspect some nice things would result from the green-yellow suppression. Coryos and Pardalos are alos a toss up, but some Barbata x Coryo hybrids are stunning, looking something like a larger darker multi-floral vini Maudiae-type.
Good luck, and keep trying. Though I don't agree with most of his theories, Goodale Moir once said that until you have tried a cross at least three times both ways, you don't know if it will work.