I'm guessing you need more tong weight. You don't gain tongue weight by loosening or tightening the bars, load stuff to the front of the trailer to give more tongue weight.
anaro is right about going to the scales. OldCoot is right in that bad shocks can be the culprit as well. The reason I asked about your WD bars is too light of bar can also cause it, but #1000 lbs bars for your TT should be good.
Russ & Kim
2014 Alpine 3600RS
2007 Dodge Ram 3500 5.9 4X4
2008 Harley Davidson Road King 105th Anniversary
(2011-5 bad year)(2012-40)(2013-45)(2014-23)