I don't feel that the oatmeal added much to mine and I did add 8 oz of malto-dextrin but it is still thin. My ABV was higher than I wanted, around 7.5%. Glad you like it!
White Labs is still well-under 20ppm when in a full batch, so technically gluten-free. Or if you want to take it up a notch, you could get some White Labs yeast, then make a gluten-free starter out of fraction of the vial and you could easily get to below 10, 5, or 1 ppm from the yeast.I wish someone were making a GF liquid yeast because the yeast seems to really alter the quality of the flavor. I really don't have time to figure out how to make my own liquid yeast but I wish I did. I'd start with trying to get the yeast from Three Floyds Alpha King and go from there.
My father-in-law used to brew. In fact, I've got all of his old equipment and it is what I'm using. He had a neighbor at one time that used to isolate and grow yeast cultures. I'll have to see if my father-in-law is still in contact with him. If it isn't too tedious or time consuming I might have to get into it.
My wife is very sensitive. She's had somethings that contained very low levels of gluten that made her sick still. Though we did have a beer that was in a red 4-pack that had been made with barley but was treated somehow that used the lower European standard for "gluten free" that didn't make her sick. So clearly there's a cut off somewhere.
Tried the first bottle after just under a week and the initial flavor is good but it finishes with an add dough flavor. I don't know what that is and I hope it goes away after a week or two in the bottle. It sure didn't taste like that going into the bottle.
I think that dough flavor might be BRS. It goes away after a short while.