Know the feeling, I'm struggling to remember myself!
When I changed to an Astroflight on the weapon at an XFM event (before it blew up..) it gyro-danced to a ridiculous degree, but that was after I'd gone to 2WD I believe- so even having wheels pretty much in line with the disc isn't going to solve the problem entirely. The gyro effect will depend on many factors, having a smaller diameter disc and relatively wide wheelbase ought to help though.