The easiest way to get rid of the wobbly wing is to use a mount where the wing is kept in place with screws, not body clips - as luck would have it, ORB Racing offers a wing mount for the B-Max 2 (Mid-motor) that has exactly that feature
Here's a link to some pictures on Dropbox:
https://www.dropbox.com/sh/9k6lpzodb..._emrmcsqa?dl=0