New pro comp shocks now too soft

My discovery has 2 inch spacers and 2 inch springs on old shocks. Ive replaced the rear shocks for pro comp +4 inch, and changed the top shock mount so they are pin to pin. All looked well until I drove up the road. Felt very spongy on the back. I then went over a bump in the road and bang went the bump stops. Now I need to be careful when driving it about cause it can bottom out on anything. The springs on the back are bearmach heavy duty +2 inch apparently. I got them off a guy who said they were. Im not so sure now. I think they are light dutys. Any way of telling?
Anyone got any suggestions before I go spend £80 on new +2 inch heavy duty springs


Cheers

ive got a procomp lift kit on mine and im guna change it soon,its not very old and the front springs have sagged and 2 of the shocks are leaking.im guna go for a terrafirma 1 next time.theres loads of diferent spring and shock combos and when you tlk to companys about them they actualy no about the product.

Are you sure it's the bumps stops knocking and not the new shocks bottoming out.

No I cant be. I cant bouncy up and down on the rear bumper and nearly bottom the stops out. Bout 4 inches from bump stop so driving over a speed bump it goes all the way

are they blue bearmach springs

Yeah they are. They were an ebay special so might not be true

Ye I think that's wot mine were.mines been bobtailed so the rear is about normal height but the front is really down and the shocks are awfull

Right. I now have +5 pro comp shocks pin to pin and terrafirma +2 springs.
The bottoming out has stopped but the springyness is still there. Its like the shocks cant keep up ot they are just too soft . I think the pro comps are no good.
Terrafirma +5 s for the pin to pin now?

Best use classic ranger over springs !! They're propper strong !!!