...either need a serious overhaul or have to go permanently, in case there's nothing that can be done here to make it look at least a little bit more natural and realistic.
The twitching is WAY TOO distracting, and certainly not in a good way at that.
Don't forget that many boobs these days are plastic...;)
Also, you may find the "Giganticus Robustus" software switch affecting breast size and jiggle/wiggle factor, etc., to be of interest. I would try to avoid using the /rh switch (/rh = really huge) when running the breast inflation command, though, as they get really, really big--too big, imo...;) So big the NPCs sometimes float away--and no, I did not use the /h switch (/h = helium) in tandem with the /rh switch. Honestly, I don't know what would happen if you were to do that!