I wish I could answer your question but I changed my variator, exhaust, and torque spring all at the same time; so, I can not positively say that my top speed was attributed to soley the variator change.
Im really the only person on here who consistantly posts who has a Like 50(70 now!) 2t. Hopefully some of the guys who mod on here will be able to chime in on our inactive Like50 side of the forum.
However, in effort to help some bit, the Like 50 variator also works on the People 50, Agility 50, Super 8 50 and Super 9 50, so this question can apply to those parts of the forums as well.
Did you figure out what caused your drop in speed yet?