cwfr_001 - At this point it looks like you have lost confidence in the coach. I can tell you from personal experience that motor home models drive and handle quite differently. We rented many times before buying our first motor home about six years ago. Some of the rentals were just like hopping into a large van and taking off for both my wife and I. There were class C types. On the other hand we rented a 32' Storm class A a few years back that was white knuckle all the way.
I suppose this is a little late to say so, but why did you not get these handling issues front and center before you bought? That would have been the time. Now if you have lost confidence in the coach you better see what you can do to back out of the deal. And BTW, many-most motor homes handle well. So don't give up. Just test test test until you get what you want.