When one likes a manufacturer so very much that it blinkers one to the objective truth.
What is needed of course is some klippel /spin measurements of ATC designs.
Keith
You could get in touch and ask ATC for their NFS measurements if you like. I'm not doing this for you. In the meantime I have no specific reason to doubt their performance and all the indication is they would measure very well under your specified measurement conditions.
In the meantime, the in-room response looks great in my space. I have KH310s LCR as part of my Atmos rig alongside ATCs with a sub for 2 stereo mixing. The ATCs actually measure flatter in the listening position and subjectively sound better too. I'm not sharing my measurements with you unfortunately as it's none of your business. If you want measurements, do them yourself.