Ben, sorry I missed your post. First question from me, how are you brewing a gluten free wheat beer?
To answer your question. Long ago, I brewed a couple Belgian-style wits, using Danstar Abbaye Ale dry yeast - not much I remember about those beers. More recently, my American Wheat Ales have used US-05, and these have been better, though not excellent.
Yesterday I was at lhbs picking up grains and yeast for my upcoming IPA. In talking with the proprietor about my recent Wheat Ale, in which my O.G. came in lower than expected, he gave me a great tip. He suggested adding about 4 ounces of rice hulls to my next wheat ale grain bill, saying that the rice hulls would help extraction by loosening up the mash.