It'd really ****ing help if I could see where you put your cameras and how many ticks you made in between each one you asshole but I see you don't like to give details.
Based on what I saw on the video I can tell he has too many too far away for the number of ticks separating them.
I just tried my hand at smoothing in gmod, didn't go out too hot but once its rendered and everything I'll see if it's worthy for Youtube. Got cut out early because I ran out of disk space. :I
Hard drive better get here tomorrow.
Also, I know a neato method that keeps the frame rate the same no matter how much crazy stuff is going on so the FPS never fluctuates and everything is nice and smooth like yo' girls smooth white ass nigga