Normally, you would measure tiller on recurves and longbows from the ends of the fadeouts in the bases of the limbs. If your Gamemaster is camo'ed - andall the ones I've seen are -you won't be able to do that.

Usually, the bottom limb should be anywhere from 1/8" - 1/4" closer to the string than the top one for shooting split finger release. If doing 3-under, the measurements ought to be close to the same.

Since you can't measure tiller correctly, I'd lean more toward paying attention to how the bow shoots. If the bow shoots okay for you, if it draws evenly and doesn't want to pull up during the draw (which would mean the top limb is too strong compared to the bottom one), if it doesn't kick and make noise when you shoot, and if you don't have to really raise the nocking point way high or lower itbelow squareto get good arrow flight, I wouldn't worry about it too much.