My 8 does have a modofied suspension with ACS springs (which I think are rebranded H&R) with Bilstien shocks.
When cornering under load the rear end seems to sway outward and snap back. I don't think the wheels are slipping, I think it's just body roll or maybe something suspension related. Is this normal? Thanks in advance!

IT can be a question liked to the road on which you are driving. If you are coming from a stiff suspension with minimal body roll the sensation is probably due to the body roll of the stock suspended 8.

I went from my lowered and very stiff 8 to a 2000 Range Rover on air suspension this winter and it was scary to feel like I would be seeing the ground right outside the passenger window at any moment. Learned to drive slower really quickly

A good educative topic, Thanks