PBaldwin: Some rounds I can't ding any approach shot and end up with constant 15 foot putts or more for birdie which means I'm left with a bit of work.
PBaldwin: I've been using the highest spin Nike balls
PBaldwin: I still feel I don't have enough stopping power.
This is exactly what PJC stopped doing as he mentioned above. You're putting way too much emphasis on stopping the ball. Learn to control the ball, not how to stop it on a dime. There are way too many scenarios on the greens across the courses where trying to throw that dart is just going to cause you grief.
G20s with their high, soft landings and a ball with decent spin like the cheaper Callaways is more than enough to score well with, you just have to know how they play. You can throw a dart with them, it's just a soft-tipped dart. :-)