Nice that it all works after installation. Do you have a RH10 head? I'm wondering what diameter the Drouin manifold is, 30mm or 32mm?
Did your exhaust valve covers grow fins when you installed it?

Regarding the front brake, sure it can be "improved" with m/c diameter change, braided hose and better pads. Repeated hard braking will induce fade and worse. True even with stock Commandos ridden aggressively.