IT shows less if you start out by decreasing in the purl ribs. So work a round by k2 p2tog, k2, p2 and repeat that around, work a round in the new rib k2 p1, k2 p2. Then on the next round dec the other purl rib - k2 p1 k2 p2tog and work the new rib k2, p1, around. Then on the following row, do k2tog, p1 k2, p1, work a round with no decs and finally k1 p1 k2tog, p1, and a round in k1 p1 ribbing. Then do a final couple rounds as k2tog around.
sue- knitting heretic