Trying to make sense of 3000 MU Grouping on this AP

For the shown CPE positions 3D that natural (you use cambiums 4x4 antenna with ~35 deg grouping angle), EB and 07 are ~17 deg, D5 ~25 deg, 88 and 1B~30deg. Everything fits.

For others, it is a bad position

The bad thing is you can’t change the grouping angle on the 4x4 cambium antenna because the axial distance between the 2x(2x2) antennas is fixed.

That’s the reason why there was a call for test-users for this antenna with a changeable (optimizable) axial distance (last video)

you can play around with the frequency and axial distance on this link, important is the position of the zero (-40 dB). For example 5800 MHz frequency with 2 elements (2 x (2x2 antenna)) and axial spacing 60mm (play with the phase delay to see the beam steering)