I found with my triton, that when I moved the motor as far forward as possible the crankcase mounts touched the frame mounts. I'd moved the motor forward a good inch. The bike became much more positive, - lost it's vague feeling and it gave me much more confidence. The 500cc manx I rode was even better. I know some modern bikes have 50-50 weight distribution, I cannot see how that works. It is probably always a matter of 'suck it and see' however the changes to find the optimum are not cheap even on an old bike. I think the forward lean on the commando engine is a good thing.