On p48 of the manual they talk about resistors in parallel on the MR and tweeter.
Two 3ohm resistors in parallel is 1.5 ohms, so you releasing any monkey grip on the drivers with those resistors, and I doubt that damping factor will make a huge difference there.
Then on pg 65 it shows a graph, which I assume is impedance(??). And then woofer appears to have some swings in it. Whether the speaker responds to DF at the low notes is questionable.
I would just try min and max, as a start.
And probably lean towards min. I don’t see any way to know for sure with just listening… and I suspect it makes little difference with the resistors in line.