I've built spinnerbaits both ways for my customer. I believe it is personal preference. I don't use reflective tape, but I would put the reflective tape on the convex side. In your case you want to put it on the inside of the convex side. The inside of all my blades are polished smooth to reflect either the brass or chrome finish to give off flash. You also have to figure that fish don't always follow a spinnerbait. They may see it from the front or from the side and then hit the blade. The only time I would believe that fish see the blade is when the spinnerbait drops on the cast and or if you slow roll the spinnerbait along the bottom. I personally believe that most of the time the blade is spinning too fast for the fish to see it and when they hit it, it is a reaction strike. JMO