Its likely the shocks are maxed out. I havent replaced mine yet either and like you, if I hit a speed bump just right it will hop 2x.

 

Yeah go with the leveling kit and you'll be fine.
Some come with relocation brackets/extenders for the shocks so you can keep stock shock size and they won't get maxed out because of that.

 

Mine is leveled and picked up longer shocks for the front also. so far it rides fine.

 

And i know I need longer ones on my front end but havent had the time or funds to price shop some new ones. Hopefully next week i will get into that.

 

I read that you must maintain the stock shock length. Apperently the shocks control the travel and if they are longer it will bind the ball joints causing them to ware much sooner.

I'm interested to see what comments those of you who have the longer shocks have. If you are not noticing any exesive ware, what length did you get?