[beetle1303]

i dont know much about swingaxles but why dont you try a camber compensator?
Its the flat bar that attaches under the gearbox and has two ends (one on each axle and mounts at the end of it) or something like that
This would prevent your rear wheels from tucking under thus eliminating or at least reducing camber change at your rear wheels
The prob is that your rear wheels go into positive camber during weight transfering (this doesnt assume body roll)

Chris