With the Stits and Polytone process, putting the rib stitching on top of the pinked tape is the way to go. Any kind of stitch under the pinked tape and you get air voids on each side of the stitch which makes them look very unnatural. Cover the airframe, one coat of Poly Brush, put your tapes on, another coat of Poly Brush (preferably sprayed on this time), and then put on your rib stitches with the glue. They will tend to pucker but that's not necessarily a problem as they are going to be way too prominent anyway. After the glue dries, put on a couple of coats of the Poly Spray (Silver) and then sand the stitches down to something virtually flat, no more than the thickness of a piece of paper. Then respray with the Poly Spray and put your color coats on. The result is subtle but well defined because the paint conforms tightly over the stitches whereas the pinked tape does not. Its some work to do but if its good enough for a Top Gun competitor (and winner), its good enough for me.