IMHO one of the best (and most cost-effective) practice tools for snubnosed J frames is a set of laser grips. Dry-firing a few hundred times greatly improved my trigger technique. I learned, among other things, that I couldn't keep the gun on-target through the trigger stroke when used the pad of my index finger, which I had been taught was the "right" way; using the first joint of my index finger shrunk my groups considerably (although they're still not nearly small enough for me).
This is the same technique I figured out too.. I feel like I shouldnt be doing it because thats one of the first things you always read about trigger control NOT to do but it works for me..??