Printing Square....

I've been in the 3D printing game for a couple years now, and have NEVER run into this.

Can anyone explain? This machine just recently had it's linear bearings swapped from the cheap chinese kind to the IGUS delrin bearings, and a E3DV6 installed.
I double checked all the frame components were square still using multiple squares.

Yet I continue to get, THIS.

Can anyone help me correct this?

Have you checked your belt tensioning? maybe in the process of changing the bearings something got changed. Or maybe there is more play in the bearings??