We made a fairly similar beer. I didn't like it at first, but it has really improved over time. You can see more detailed tasting notes in there.
I have never had a gumballhead though...so you will have to derive your own comparison. I think simcoe would be a welcome addition to this beer in both flavor and aroma, but I would keep it balanced. The beer I am drinking is hoppy, but you can definitely taste the backbone of wheat. I would keep it this way.