Adding an airfoil to the horiz tail may seem to improve glide performance but it can also greatly complicate the overall trim to keep the glider straight during boost.
There is also the whole Reynolds-number thing, where it is not clear at all that any airfoil anywhere on the glider actually has a better lift coefficient than a flat panel. In case you don't have the background, aerodynamics for "real" aircraft (at high subsonic speeds, or transonic, or supersonic) are quite different because of the high Reynolds numbers. Airfoil characteristics (like the kind of lift, drag, and moment data you see published in reference books) are for this class of Reynolds numbers.
When you slow down (several orders of magnitude) to the speed range of hand-launched toy gliders, and insects, this gets into a whole different field of specialized low-speed aerodynamics. Bumble bees and dragonflies fly just fine with their hairy, lumpy, crisscrossed with blood vessel ridges (not smooth), overall more-or-less flat, definitely not airfoiled wings, pretty much in direct contradiction of "classical" subsonic (human) airfoil theory.
Our boost/rocket glider wings fall into this speed range, at least on the way down. Even during the ascent our rocket's Reynolds numbers do not creep much beyond this speed range. This all suggests that flat plates will work just as well for our purposes as fancy airfoils and delicately shaped aerodynamic surfaces.
Kinda takes the fun out of things....
Definitely makes if way more simple to trim a glider for boost.
