Hi Bryan,
Maybe you have a different Wixey, but mine is type 1 and it's certainly not under 60g as you suggested. The weight is 120g, as you can see in the image below.
Sure, the Wixey is a bit lighter but not by that much and the TLL-90S should be a lot more accurate (± 0.005° compared to ± 0.1°).
I initially set my incidences with the Wixey but when checking them later with the TLL i found a 0.4 degrees difference in one of the stabs. I usually measure both wings, then both stabs and start over. I do this 4-5 times to make sure i have accurate, repetable values for all incidences.