thanks for the responses!

My current wing has a 1" constant thickness and a 2" taper in the chord. The tip airfoil is basically a shortened version of the root but still retaining the same thickness, so the tip is actually thicker in proportion to it's chord than the root airfoil. From what you folks have recommended, I plan to move the tip's max thickness forward a bit, sharpen the root's leading edge, and maybe even move the roots max thickness more to the rear.

On a side note, I notice that the Funtana, the new 3D ARF from Horizon, features a tapered chord but with a constant thickness. The add says it has great low speed stability.