Have you actually tried the MGIV-FB glossy? I ask because different drying methods can effect the surface finish, so I wouldn't rely too much on the swatches: they may have been heat dried, and heat tends to give a glossier finish.
If still no good, you could look at Kentmere Fineprint's "fine grain matt" finish. I have not used the standard paper in that finish, but have with the Warmtone version and it has certain similarities, being a semi-matt finish.
Cheers, Bob.