So, we are talking rear bump steer right? Adjusted through traction rods, which you now have?
if you have a dial indicator, making a bump-steer gauge is pretty easy, no shortage of pics for reference on google. Mine cost me about $20 in materials from Bunnings. The dial indicator is the most expensive part. I can send you some pics of mine if you need.
For reference - my car is dropped about 30mm. It was a while back now I did it but from what I recall when I adjusted for minimal steer under bump, it would then bind more under droop, so compromise was needed. The 'best' setting I found was set the rear camber to where you want first, then start with the traction rod at stock length, and then increase it by the same percentage length as I had increased the camber arm. That setting has worked fine for me and gave the best bump/droop readings so hadn't worried about it any more than that, but then again I'm not track-ing the car.