So, what did you do today?

[michaelmosty]

The bushings and arms were replaced at the beginning of 2013, so they've got about 8 weekends on them.

I'm sorry to hear of that Kevin.
Bottom line, it doesn't matter if you run the stock 4-link, the PM3L, have stock bushings, poly, or spherical. The 4-link suspension is just going to continue to destroy itself.

The best option out there is to spend $650 for the kit Jerry installed, then pay hundreds more to install it (or be fortunate enough to do it yourself), then pay hundreds on top of that for new UCA's, and then your upper issue will be fixed. Of course, then you'll still have the lowers to worry about.
The $400-500 torque arm is looking like a nicer solution IMO.