There are things you can do to get rid of it, Those things involve modifications to your printer though.
The Flashforge printer uses a single leadscrew raising bed design. The X axis isn’t attached to the Z axis at all, and the single leadscrew is much closer to the two bearing rods. It may also have an anti wobble built in already. The Taz design has that minor banding due to the placement of the leadscrew and the bearing, and the slight flex in the metal plate. If you look closely at your Z bearings on the Taz, you will probably find a 0.01-ish gap that the bearing can move on that rod. The rod is also able to flex a little, particularily in the middle. The metal plate can also flex slightly, and the leadscrew, being in between the bearing rod and the X axis mount, can axtually exert slightly more leverage than the retentive force of the bearing. There is also a tiny amount of backlash present in the Taz leadscrew nut. All of those things can tend to result in that pattern, It’s very shallow, hard to feel, and usually only visible at certain angles or light conditions.
Check out the development forum for some ideas on how to get rid of it.