Hey Julius. You must get plenty of runtime with that pack!
On your B, I noticed your using the Anderson front tires and the M18T rears. Which are slightly different diameters. You can use the narrow front tires from the RC18T by cutting of the outer lip of the inside of the M18T rim. Then using the now exposed inner lip of the inside as the new outer. Thats what Zack did for the nats for his narrows.