When I look at the hat, and your description, I can imagine walking over to the woman with the high cheekboneswho's sitting pensively on the rocks and pinching the top of her hat and pulling it up. I imaging that it would look much like a chef's hat. There's a lot of scrunched fabric around the widest point and I imagine it must look even bigger without the scrunching.
You could decrease it more to give it less fabric on the top--it would change the look, but it's hard to say if it would be for the best. :thinking: I've typed and retyped this, and the more I look at the pattern, I wonder if you decrease as much as you say if the hat will have enough fabric to flatten out the top or if it will look more like a mushroom. Maybe the extra fabric allows it to flatten out more.