Hi good to see you back.
The two common windings are known as Lap and Wave windings, both are designed to reduce arcing although the Lap winding is best at that. If you google the terms you will see the method of winding. The problem with reducing arcing is that you cannot recover much energy from inductive kickback. I propose simple winding, it arcs really badly and so there is lots of energy to recover. This does require a second set of brushes to recover this energy and so we have exactly the configuration of brushes as shown in JB's video.
Take a look at this video https://www.youtube.com/watch?v=Q9CLtlkl6fM
At 10 mins into the video he shows the simple winding that I used. It has superior torque to lap windings and will draw huge current but dont worry as the speed increases the current drops. I ran the motor satisfactorily on 3 to 4 volts.
You will see huge arcing so dont run it long or your commutator and brushes will burn up. Install recovery brushes and see how much power you can recover. At high speeds it will be more efficient as you approach the natural resonant frequency of the coil. To be honest I dont think I ever got it on the resonant frequency as the speed was too high and the thing would have flown apart but I reached a harmonic of the resonant frequency.
Listen to the motor, you may hear a waaaawaaawaawa as the thing accelerates. You will find the maximum recovery coincides with a particular sound. This will be a harmonic of the resonant frequency. If you cant hear this sound I will tell you how to use a speaker to achieve it, sort of a stethoscope hahaha