Pulling A Fifth Wheel vs. Bumper Pull

I just bought a new 37' 5er. My previous rig was a 32' bumper pull, both were pulled with my 2013 GMC 2500HD Duramax. The truck has plenty of towing power for either. The new 5th wheel is awesome, we love the lay out over the TT. My only problem is that the new rig doesn't tow nearly as well as the trailer did. This week was our first time out and the "chucking" of the FW was terrible. When you hit a bump or dip in the road it sets up a forward and backward jerking motion that is very uncomfortable and unnerving. From what I've read, it's very common for FW rigs and it's a trial and error process to improve the condition. Also most remedies are expensive and may not even help. I'm not very happy and almost wish I had my bumper pull trailer back.