I use soft proofing mostly to see what is out of gamut and what is not. If nothing or only small areas are out of gamut, then I will use relative colorimetric rendering. If there are largish areas out of gamut, I will consider using perceptual rendering. Apart from showing possible gamut problems, I find soft proofing matte papers a waste of time - the soft proofs always look too muted and washed out. With gloss/semi-gloss/lustre/silk/satin/pearl/semi-matte/photo-matte the soft proof works.
Brian A
