I did some tweaking with the Lua for the Duncan, and I've gotten her to track and engage multiple air targets independently, more in line with the real-world capabilities of the Type 45. I also created an Aster 30 unit to more closely model the tracking and kinematics of the real Aster (though it still uses the 3D model of the SM-2 because I only know how to mess with code, not models). With those changes, she is a beast — nearly unstoppable. Which I guess makes sense, considering how new she is compared to most of the ships in DCS.
I don't want to step on the Admiral's toes, but if @Admiral189 gives the okay, I'll gladly post my update here and/or PM it to him.