Update/Solved:
I tried everyone's suggestions. I reflowed everything and I capped it since I was already reflowing the boards. Nothing seemed to correct the constant oscillation and violent shake during explosions and other loud events. I even substituted a known good ARII, another power brick, and basically anything I had an extra of to try and isolate the cause.
If I physically hit the monitor it would make no difference but yet loud sounds made it go crazy. I was having a difficult time believing it was vibration, especially after reflowing everything. I took the monitor out of the cabinet, placed it on a table, connected it with the extender and even then loud events would make it shake. Lower volume settings would have no effect and would reduce the constant oscillation.
During this entire process I was also frustrated with the volume pot, it was difficult to adjust sometimes and the volume would appear to change volume on its own. I went to my parts box and grabbed another Space Duel service panel. I noticed that the volume pot's construction would allow adjustment from the rear and in this case that would be easier since I could rotate the arm rather then trying to grab the thin shaft (my fingers were hurting already).
When I went back the cabinet and tried to adjust the pot from the rear the problem became obvious... the service panel was bent down and the volume pot was grounding out against the coin box. I could not believe it, when you would turn up the volume to a higher level the arm would come in direct contact with the coin box and that's when the image would get really bad during louder events.
I bent the service panel up so that the pot was no longer anywhere close to the coin box and bam, gorgeous steady image regardless of the action.
So there you go... it was the volume pot grounding out. Learn something everyday... Thank you to everyone for the suggestions.