I've worked on the hand-to-hand independence for a lonnnnnnng time...., but I'm still a tad better/quicker/smoother right handed (I am right-handed).
I do think "mirroring" helps facilitate proficiency as long as you don't
only mirror what you do with your stronger hand with the "off-hand".
Some folks seem to not like "mirroring" at all, but that smacks directly in the face of quite a few "Motor-Memory Studies" done by some very reputable Kinesiologists.
If you only do "Copy" techniques <~~ the
EXACT same manipulations with both hands.., you will develop a dependence that is a hinderance to developing independence between your left and right hand. This varies greatly individually, and there is certainly carry-over value for those that have been active in sports and skills that require independature between hands (i.e., Basketball) <~~ just an obvious example.
It seems that a combination of "mirror" techniques in combination with a true effort to incorporate independent manipulations works best for most people. The exact formula depends on what you bring to the art of Balisong manipulation by way of experience.
Much like percussionists, the very best of Balisong artists.., develop almost total independature between hands. This does take time and patience.., and a little
blood .
"Hunters seek what they [WANT].., Seekers hunt what they [NEED]"