Hi Paul,
I wint through this whole bump steer excersise with the rear of my Classic Revival.
I built new arms because I wanted to narrow the rear end and get rid of the bad bump steer with the stock rear end. Here's a link to the thread
Rear suspension mods.
If you graph the change in bump over the wheel travel is it linear or does it peak at the ends of the travel? I managed to tune nearly all my bumpsteer out but it still has a little. This is down near full droop but most of the travel where the suspension works there's hardly any bump.
3/32" doesn't seem like too much if it's down near full droop. I'd just align it so you are always in toe in backing out to zero at full droop.
It's not a nice feeling when you stand on the brakes at high speed and the rear end is doing toe out.
Cheers