Few Simple Questions

[RC-Monster Mike]

The bow ties actually hold up pretty well on pavement. Pretty much any tire/wheel combo of standard size will be lighter than stock. The RDLogics tires will hold up well for pavement driving fine as well, though they are not as light as the bowties.
For your sticking servo issue, I would take off the servo horn and reposition it so it can't over extend. It sounds like it is turning to far. After you reposition it, you should be able to make up the difference with your trim. If not, you could shorten the linkage.