Once you have tightened both sets of u bolts and you still have issues you might check a few other options. I cant recall what the base of the pylon goes into but I remember putting shims in my 93 as the pylon set in a base and there was play at the bottom where pylon fit into base. If you have more of a glassed in bracket similar to an 2008, have someone really try and move the pylon back and forth hard while you watch the bottom bracket! I had a bottom bracket break, had to pull motor and glass in a new bracket, solid as a rock now! $1500 at dealer.