I tried to go cheap and just replace the front sight with a metal one and not much help. So I got two sets of Trijicon non-tritium sight sets, (Brownell's 892-000-119 @ $38.00) and put them on my Glock 19s.
Success. Group size went from 5 to 6 inches (5-shots @ 25 yards) to 3 to 3.5 for both Winchester 115 grain FMJ and Federal 124 grain Hydra-Shok and at point of aim.
So a couple more on my Glock 26s and problem solved. Still annoyed at Glock for making it a problem in the first place.