I have a few options, but my current direction (hehe) is to leave the coils the way they are now, just wire them in series to maximize voltage, and have simply two wires output (input and output of the three coils in series). That should be a pretty high-voltage (around 50V at 3500rpm idle with no load).
The max voltage setup would be to run all four coils, wire 180-degree pairs in series, then wire both pairs in series I guess? Should be around 65V at 3500rpm based on my testing.
I'll try a few things out in the next few days and see what kind of numbers I come up with.
Here's the clearest info I've found thus far, makes lots of sense and really helps quantify stator output with simple real-world testing:
Ah, the pains of being a MechE when you didn't pay enough attention in your single circuits class 6+ years ago...