Your rear suspension binds up,it just happens as it nears the ends of its travel.In the ej setup the suspension binds up long before the axles will fail and before the strut runs out of travel.The EJ rear strut has 8" of suspension travel, but actual wheel travel would be closer to 9-10".I don't know how much travel EJ stuff has but even EA81 rear axles can support 12" of travel, not even including the additional angle possible when the DOJ stretches.Everything I have read says the EJ axles can be run at steeper angles than EA stuff, so it stands to reason that they have even more potential for travel.
From the flex pix it looks like you are only getting 6-7" of travel compared to a possible 12+.Even EA81 rear suspensions can be adjusted to give 12" of travel.For EA81s all that is needed is shocks that travel that far,EJ rear suspension just needs the suspension binding to be cured/eased.
Edit: If I draw lines in paint from the center of one tire to the center of another tire, then a line as tall as the tire and compare it to a line between the two centers I can come up with a simple ratio.According to paint the line that is as tall as the tire is 45 pixels, while the line between the two centers is 10.10/45=.222 I think your tires are 29" so 29x.222 = 6.38" or 5.94" if your tires are 27"
You're definitely right that the rear suspension binds up at full droop. I hadn't thought about the bushings having to flex sideways, but that certainly doesn't help. What amazes me is that, from what I can tell, the bushings are bonded to the inner and outer sleeves so they have to flex just to pivot normally.
However, you don't have to compress the springs/struts to get them in, even with a 1.5" lift, so I don't think that really limits travel.
Also, a flex pit isn't going to compress the stock springs and struts close to full compression, or you'd be bottoming out constantly, so that isn't going to show the full extent of travel he's getting.
Northcoast - I like your rear bumper/tire carrier/plastic bumper trimming.