Hi Ross,
Good to see you in this neck of the woods.
MMarlette,
I've not used the DFLL, and I don't have the manuals readily available at the moment, so I could be wrong here, BUT:
I thought the DFLL was for tweaking the Internal RC oscillator ( s ), based upon an external 32.x kHz Xtal, (or whatever the reference is).
The point is this, I think DFLL tweaks the RC osc, and has no impact upon the clock frequency when one is using an external Xtal.
When using an external Xtal the Xtal, (and its caps, Vsupply, Temp, etc.), set the frequency, not a tweaked register.
Perhaps others will confirm the above, or verify my memory is failing...
JC
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