I think I might try the props from the P1 to see what they sound and fly like. As the lift is a product of swept area and rotational speed, the smaller area of the props is likely to give reduced lift unless the motors rotate faster.... I'll give them a go and see how they sound and fly but will wait for a good flying day just in case of 'issues'.
I seem to remember seeing Colin Guin demoing a Vision fitted fitted with black, presumably carbon fibre props. Hopefully, getting the correct props will sort this one out.