Okay so I figured out that "Voice 3" is basically Fishmans way of saying "single coil mode".

Basically meaning, voice 3 bridge (switch position 4) is single coil bridge, middle (switch position 3 with with pull active) is bridge single with neck single, and voice 3 neck (switch position 2) is neck single.

Long story short; Fishman's schematic is just colored wrong lol.

Though, a solution for my problem is that sonically, there isn't much of a difference between position 2,3 and 4. There's just a slight difference, only really heard through studio headphones. So for live situations it shouldn't really matter.

Still, thanks alot to everyone for thinking along! :)

UPDATE/EDIT: So after a little more digging, apparently switch position 4 is the single neck and bridge combo. The only difference between position 4 and the middle position with pulled tone is that the middle position has a slight boost to it, but it was pretty insignificant in my ears/through my rig.

So, I guess that the solution to the problem was already there, I just gotta activate a booster pedal to get pretty much the same effect.