The axle moved a long way but the "triangular" bushes were restricting the downward travel, with the car cross axled a foot on the trye could push it down against the rubber of the bush, it is true that kinking the radius arms would have helped but the bushes would still be stressed.
The third link using the front radius arm bushes is an idea I borrowed from the Gon2far three link, the first fitment as used at Bures had rubber bushes which didn't last the whole day, now it has poly bushes which should last longer. In time, if they turn out to last, I would like to replace them entirely with anither Gyro Joint.
As far as axle tramp goes, I avoid driving on the road when posssible not least because of the fuel economy but mainly because it's like driving the Isle of Wight ferry. The front three link and long shocks allows an alarming amount of body roll, and articulation. See here.