I think Hugo will find the warmth of the Canson BP pretty much identical to Ilford's Gold Fibre Silk, which if I understand correctly, he's looking to replace with something less warm.
Hugo, you might wat to take a look at Ilford's newer Gold Mono Silk. Slightly whiter base, and though advertised as primarily for B&W, it does well with color too IMO. Thinner than GFS, but a nice paper. And, for matte, I've been generally pleased with Epson Hot Press Bright (though I understand it has OBAs).
Rand