guided is a bad complement to any other bow skill, as it can't pierce (so the skill is useless) and it always hits (so penetrate/ar is also useless.) however, these two things (pierce and ar) are vital to all other bow skills.
how are you playing? are you mainly usings ga, or only ga vs single monsters/bosses? if so, then you should put those points into pierce as you are using ms mostly.
if you are using GA the majority of the time, then the only skill(s) that will help are crit strike and (to a certain extent) valk.