Do i need new shocks?

So when i go over a ditch (not a big ditch) i wack the crap out of my bump stops. It seems like its way soft and springy in the rear end... is this because i took my spare tire rack and all of that junk off back there or should i just slow down or get new shocks or something?:p Also my rear end is now alot higher than the front..... im sure thats from the 150 lbs of rack and tire i took off right, but i want to even it out somehow