Well, I tweaked the driver, so I think just slightly adjusting what I'm doing has leveled things out.
Also, it just occurred to me that I have been driving around close to 1/4 tank of gas -- I usually keep it over 1/2 a tank. That's less weight over the rear tires.
Anyway, after some more driving around, it definitely feels much more responsive over all -- even lane changes feel smoother and require less input.
Definitely a worthwhile handling mod