Hi Phil!
Thanks for your response!
Firstly the Purifier Psycannon issue you are having is not a bug just a function that I'm guessing that you didn't even know you have. There is a similar reference in the internal maintainer faq, Question gk1. Just use the same principle for the Purifier Squad as I did with the Terminator Squad. To save you any further struggle. Here!
I hope that this will clear things up. If not I would be happy to help walk you thru!
On a side note:
Spack, can I link to the FAQ page yet? (I realize you might be busy with the recent server events)