My son is four years old, and he has a double crown also. It sounds like Gena's son's haircut is similar to my son's. We get his haircut the same way every time. We have tried something different once, and it really was awful.
We get the top of his head shaved/cut at a #4, and the back of his head, all the way up PAST the crowns done at a #3. We then take a small amout of hairgel and spike the little bit up on top with a comb, and it is just adorable! The hairstylist should know what you are talking about.
I will tell you, that we did not SETTLE with this haircut. It really is cute and the way it looks best. It makes him look nicely groomed, and well kept up. Another positive side to this do, is that you can let it go longer without a trim-up, and it really does still look good until the next haircut trip.
Good luck and don't feel discouraged! I felt the same way when I realized this issue, and it honestly has not bothered me since!