Experiment - Leveling the arrow inserts. Instead of applying heat directly to the insert, I made a hot plate and heated only the top of the insert. To my surprise, this worked great.
Using hard hood, I cut and sanded a block of wood to match the inside of the 1.5 inch arrow insert. The wood fit snugly into the insert.
I found an old metal shelf support and used it as a hot plate. Using a clamp, I placed the top of the insert onto the metal plate. Apply a little pressure, just enough to hold together.
Apply heat onto the back of the hot plate. I used a heat gun on low and heated the metal plate for about a minute or so. I never pointed the heat gun directly at the insert, only heated the back side of the plate. Now squeeze that clamp down hard while the metal plate is hot.
I let the insert cool down for about 10 minutes before removing the clamp. I'm very happy with the results. The arrow kept it's shape and the top is fairly level, no more cupped effect. Also, the sticker never came off. Now I'm able to keep my original arrows and stickers! Before and after pics.