I would say Rahr Red Wheat malt would fair better than white wheat. I do not like white wheat though, it is a little on the bland side to me. I also would think a touch of caraWheat to add some depth of sweetness to go with the Amarillo citrus hops would go a long way. Gumballhead is probably a FBH add with a 10 min and whirlpool/dry hop. I once read an article on the best aroma/flavor combo is taking 1/2 of the late addition dry hop hops and whirlpooling them after boil under 170F. It was a 3 way blind taste on a fruity APA done with 100 blind testers and that method got the best reviews. I do believe Gumballhead is a single Amarillo hop though.
Also gumballhead is only 35 IBU