I have a bit of wind noise myself, but I dont think I have any "whistle". I attribute it to the windshield being at a 90 degree angle..... Zero areodynamics..... Thin rook with no insulation....
There is always going to be some wind noise.
Still, if yours is worse than normal, ensure the seals on your top are good, and ensure you are attaching them properly. Check all your door seals as well. I am sure therewill be more comments from others here. There is a lot of knowledge on the forum, I hope it helps.