eh, sorry, that's part of the reason its beta, i'm making a lot of changes and trying to save the previous versions, and didn't include the new main file(s)
v4 needed some checks, i reccommend v5
v5 has less frame drops
also, i forgot to mention this but, i added damping to the head a while ago, it helps with faster animations, but can cause frame drops when adjusted, anyways it was adjusted up/down constantly with randomness bounds activating every few cycles
Otherwise, everything above a overall speed of 15 will get some damping applied to the head
might need a checkbox or something, but there's no other way to stabalize the head of a model