Phrag. Grande typically appreciates growing wet like most other Phrags, but some individual cultivars are less tolerant of "wet feet" than others. So, if you grow your Phrags sitting in water, then keep an eye on your Grande just in case its one that don't appreciate wet media all the time. Of course, this assumes you're growing in traditional media as opposed to hydroponically.
In addition, if the Paul Eugene Conroy is slow growing or struggling, you may find the Grande does the same thing. But, in my opinion that suggests you may have a cultural issue. These do tend to like higher light than typical besseae hybrids, and while they don't like hot temperatures, they perform better when it's on the warm side (in my experience). So maybe it's a light or temperature issue? Also, how do you water? Are you growing your Phrags sitting in water at all times or letting them dry out?