Bro, you need to post your make and model of your ride! On a Road King, there are two honkin' bolts under the triple tree that bolt the "riser" bushings to the upper TT. Tighten them. ALso, the bars are mounted on rubber virbation isolation bushings so they do have some movement in all axis- up, down left, right front, back- but they should return to the same place every time.
To tighten those honker bolts, you gotta take off the nacelle. After you've done it a time or six, you'll get pretty good at it and should be able to do it in less than an hour total. First time sucks though. The hardest part is the 5/16" nuts on the insdie top of the nacelle that attach the nacelle's "spear" and the riser cover to the nacelle. Also there are little bosses on the front and the back of the nacell that align the halves together- be careful not to break them. The fork lock cover pops off by prying under it with your fingers, exposing two phillips screws that will come out too. Its not rocket science, but it not so fun the first time either.
Hopefully this answered your question- lets see what others have to say.