I believe I know exactly what your talking about. The radius of the edge at the tips is a larger radius than the leading edge. I cant't post a pic currently but I will say that I kept the tape on center such that the result is the tape edge falling just shy of wrapping over the edge of that tip rib. So, you might say I have only one layer of fabric lying over that tip rib. I considered using a piece of tape trimmed so that extending from the trailing edge and at an angle, the edge of the tape would go center line. I would then trim the other edge to meet at the middle. Then as I came around with the centerline tape I would stretch it at an angle to capture the reverse side tip rib. My current tape is going to have to do, as I decided that if the fabric shows wear at that point I will just lay tapes on top and bottom. Being Oratex and already "painted" there will not be a problem applying the "patch" over the stress point.
Eddie