snapping suspension?

I have a '93 5 door with a +2" lift, pro-comp ES9000 with 'floflex' yellow poly bushes f/r, im running britpart HD springs on the rear, bearmach on th front, -2" shock droppers rear an +1 1/2 spring seats, -2" turret tops front, dis cones all round etc ...

My problem is that my rear shocks keep snapping off at th top of the rod where the rod meets the bush eye, normally when under axle twist whilst doing nothing more than i would expect from a disco with this setup? ive been thro 4 shocks now on the rear (2 each side) so i am starting to get a little disheartened as i have friends wih very similar setups who have never had a problem?

help please before i put it back to standard an buy something japanese...