If it were me, I would remove all the panels and treatment and place the speakers in the listening position to determine what sounds best and then measure after that if you can. Add the panels back in slowly. I have become a fan of diffusion rather than absorption since it's been mentioned that you can kill the room when it gets too dead.
Vandersteen 7 and room treatment
My circumstances have changed in an unexpected way allowing purchase of a well, but gently, used pair of original 7's. (Also SOTA Sapphire with Ortophon Cadenza Blue in house and Supratek Cortese LCR on its way) I have a dedicated 15 x 20 room full of 14 various GIK traps and panels. Will using the EQ, contour and level settings allow me to get rid of some/all of the room treatment? Should I attempt initial setup with all/some of the panels in or out of the room? Anything to give me a head start short of trial and error. Nearest dealer is 400 miles away so on my own