Might be interesting to look at your axle position relative to a chassis datum and compare to others'. So a measurement from the front side of the axle tube to some point on the chassis for a sanity check. If your axle is further to the rear than other builds that may shed some light on the banana bracket interference issue. And in the meantime it wouldn't hurt to make sure your axle is square in the chassis as if it is skewed that may also cause an interference issue.