Then reduce your system to the bare minimum. Disconnect your monitoring system or power it off, plug in good headphones, and build a small sample preset using a single Dyna-Cab in slot 1 in the Cab block. See if that sounds hollow. Move the mic around and see how it affects the sound and continue listening for "hollowness". Turn on your monitoring system or reconnect it, and see what happens to the sound. You'll know where the problem is at that point, and the "ball of wax" might turn out to be somewhere different than you think right now.
In my experience, the Dyna-Cabs are as good sounding as any of my other 3rd party IRs, of which I have thousands from the big names. Will I immediately convert my presets? No, because they'll continue sounding good, and I need my presets to be able to transfer to the FM* units, but once we know where that technology is going on the smaller units I'll figure out how I want to proceed. For now though, I'm really enjoying the sound I got out of a test preset I made when Cliff first revealed the new cabs to us.