https://github.com/TheCodex6824/ThaumicAugmentation/blob/master/gradle.properties#L7

On this version of the forge, some mods work extremely poorly. Is it possible to install an older version as valid?

For example, on this version of the forge a lot of armor sets from the Advent of Ascension do not work at all.

You're not the first person to request this, I allowed the older forge versions (namely the recommended version) back in #15. I'll probably be releasing an update that includes this and more stuff soon™.

This new version should work for you now.