To me it sounds as though you have a combination of too soft a spring AND the shocks have the wrong valving or they are stuffed.
Pump the polyairs up to 20psi and fully load the car as if your going on the trip, then see how it is.
Forget everything you know about the D1 in regards to your D2, they are completely different to set up.
Get the shocks checked, valving does help alot, mine are Bilstein 50mm extented with 400/100 valving and my springs are a load carrying 380lb, hence the valving to stop them rebounding to quickly.
The Polyairs should help the springs, but pump them up to help with the load, don't be afraid to put 20psi or 30psi in them or even more, I'm pretty sure they are rated to almost 100psi.
Also get the front shocks checked too, they too will be adding to the handling problem.
Good luck,
Baz.
Cheers Baz.
2011 Discovery 4 SE 2.7L
1990 Perentie FFR EX Aust Army
1967 Series IIa 109 (Farm Truck)
2007 BMW R1200GS
1979 BMW R80/7
1983 BMW R100TIC Ex ACT Police
1994 Yamaha XT225 Serow
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