this isn't really an anti squat issue. The real problem is the torque being transmitted through the rear driveshaft is basicly trying to twist the rear axle relative to the chasis. Since the rear axle can't move the chasis leans. This can be a huge problem on slickrock, we have all seen video of tj's or scorpions or buggies rolling themselves over on steep but not offcamber slick rock climbs. One good way to reduce the problem is to use lower axle ratio this minimizes the torque that needs to be transmitted through the driveline and reduces the lean. different designs of rear suspensions make this problem worse or better. with your typical triangulated four link the lower links which are in compression accentuate the lean, once the chassis leans a little one link gets steeper and one link gets shallower the steeper link on the side that lifted causes that side to lift more. This can turn into an unstable system and everything can come crashing down like the TJ on the slick rock. There are a lot of different four link geometries that can minimize this problem or even eliminate it but with the uppers triangulated all you can do is make the lowers as long as you can and as horizontal as you can. All this will do is minimize the effect of the suspension geometry contributing to the lean, but you should be able to come up with a tolerable suspension lots and lots of other people have. Looking at the pics, I bet yours is fine now, just wheel it and see.
There are other ways to build a suspension to completely eliminate this effect, such as a three link & panhard with the uppper link offset to one side. That one is common in road racing.
