Then as Ping says, "Change your putter. Not your stroke."
tbowles - that is an excellent idea but I just did that. I went through a SAM puttlab fitting session last fall and even then I had a strong arc. I was fitted to a putter at 33.5" and 69* lie. I've since had three gamers adjusted to that and while I do see improvements the iPing app still shows me having a strong arc. That is where my dillema lies. Do I change putters? I've tried to 'fix' my stroke with little success. The SAM puttlab fitter did recommend the putting arc trainer but I never got one. Just tried to fix it myself.
I got fit last week. I'm still going to adjust my sticks, but I did buy a Nome to see if a difference would be made. Don't go belly or long just yet. Stick to the specs that the fitter and the APP recommended and have Ping make one for you. If you're "handsy", ask for a larger grip and see if that helps.
All I can say is that when I used the model putter to my specs, all of my misses were inside the path of the cup unless it was just a bad stroke on my part.