I know you know but ^Yea, we can fix that by backing up a bit because it's misusing M/S.
When we think of M/S... especially the S pointing 90 degrees in each direction in relation to the center. The closer you get the weirder it is going to be.
M/S is better with some distance. It is far better suited for say recording a semi-circle of instruments - recording singer/guitar is fine but it needs similar distance as M/S is not a close-micing type of configuration design.