Yes it makes sense, the tyre is part of the total Spring rate as well, so the softer tyre can also absorb some of the road noise (helps it follow the road so more contact, more grip)

Chalk will wear off too quick, even paint will be marginal but should hold up, best to aim for a little to much camber than too little

My experiments with very low start pressure also involved lots of toe in, trying to generate more heat