You mentioned what I think is the only real problem with stone. After you have shot the arrows several times at ANY target you will be well served to "micro flake" to resharpen them. At least the 1/3 of the cutting edge from point back. A heavy weight bow will put them clean through a deer even if they are slightly dull, but for bows in the 40 to 50 range a resharpening will not hurt.
Just one old mans way, and I cant say about obsidian but all my hunting heads are flint/chert and they get resharpened. Remember that if you "feel" the edge you are not really feeling the sharp part, which is down in the valley formed by the concoidal fracturing.
Your arrows look very good by the way, hope you get the chance to fling them at a deer.