Heavy hitters should always use hybrids, since the lifespan of cross strings is so much longer - you might as well use a softer string there. And if you are a topspinner, hybrids are the only way to go. Careful selection and tension can create a stringbed in which the cross strings don't move, that is the most important factor in keeping the mains from deteriorating. Plus hybrids can cut costs by allowing less expensive, more flexible strings to comprise half of the string job cost. You could even use cheaper crosses than the Wilson if you're mostly concerned with cheap durability.
Hybrids are the only way to go.
I haven't used matched sets for about 5 years. Joe, I was just browsing around the web and came upon your pages. I certainly found the contents interesting. I think it is great that a stringer like yourself goes to so much effort to help other. Pulling two main strings at the same time is risky.