do u hav a cng kit in ur car?cylinder i mean?i assume u hav.in this case,ur shocks hav completed their life due to the excessive weight of the cylinder directly above them.now this is wat u need to do.
1)get desi springs for ur car.they r stiffer then the original springs.nd get these springs installed in ur car.but u might hav a problem,nd that wud b that ur car wud b lifted abt 1.5inch.if its ok wid u,fine,if not,get one cirle/loop of the spring cut before u install it in ur car.this wud give u the required stiffness
2)change the rear shocks again,if u can afford.they arent much costly.must b below 1500rs.i got them for 800rs abt 3.5yrs ago.
if u get these 2 things done on ur car.ur problem is solved for ever....!!!!