Adjust brightness side to side, low end close and distance (for cardioid, hyper-cardioid, and figure eight polar pattered mics anyway...). It's common to mic guitar cabs way over on the edge of the cone to tame the high end, then closer in for more bottom end. Most guitar cabs roll-off their high end starting around 4.5K - 5.5K, at around 12db per octave or more, so don't forget your HPF and LPF.
Dyna-Cabs give you all the tools needed to craft any desired tone within the limitations of mic and cab choices available (and their 1024 point length in the FM3, vs their 2048 length for the FM9/AFX3, though longer is not always better depending on the quality of the IR capture).