Hi Peter,
To my knowledge, using filter offsets will be faster but possibly less reliable.
I only use narrowband filters (3nm), and have found that 20-second exposures in autofocus routine work very well, combined with 7 data points, and about 20 steps for the focuser (also Moonlite, telescope is f/5.6). Such settings give a fairly sharp V-curve pretty much each time. More steps are counterproductive -in my case as the stars then are way out of focus and HFR values are initially not changing too much resulting in a fairly horizontal trend (not good for finding optimal focus).
Hope it helps a bit
