Your
axle was originally a 2200pound axle.
I think it was 22° down.
A new 16Scamp would have a 3500 pound axle
22° down. and 10"
brakes
Wear should be judged by tire wear, negative camber and toe-out.
Shaking your fist at it won't even change its mood.
Every Torsion axle takes a set during its first 1000miles or so, then wears slowly over time.
Be aware that the normal configuration of a new axle is 5 on 4.5.
I think you would be pleased with the results if you replace your axle with a new axle of the same type as now offered on the new 16.