Resonance help for v-core 3 500

I just completed the update of my v-Core 3 500 to 3.1. I am really struggling to get it dialed back in and went to try out the new belt tension macro and after watching the video's and reading the old messages I believe my issues are the resonances. After seeing my first graphs and observations during the test I could hear vibrations coming from umbilical attached to the EVA. I have reprinted and reinstalled slipped heat inserts making that attachment stiffer. I also have the mesh table and I added corner bracing to that and used a clamp to anchor it the x direction. I have checked various bolts etc but not finding anything.
I would like to get some advice on where to start or if maybe someone can see something specific to look at since it's such a pain to dismantle .