Enclosed V-Core 3.1 500. Initial Commissioning Mesh

I'm currently running through the Commissioning Guide and been stick on this for a while making adjsutments, checking for squareness etc. I believe I've confirmed squareness, my Squares and Digital Laser indicate everything measures the same on the frame. I've been following the official ratrig comm guide and rewatched "3D Printers & a whiteboard " 's video about a dozen times. Every time I adjust my A or B corners, it throws the opposite side out as well. I've also tried loosening and retightening the X and two Y Linear Rails as directed This is still on the bare metal Bed with no Heater Pad or PEI build sheet attached Any pointing in the right direction would be appreciated