Here's my skill build for lvl 150 o3o with 5 extra points.
Anyway if you think the cooldown skills isnt worth it.. They are (Once all three are maxed)
With my build i can do endless skill combo's it goes like..
Allargando >Pretissimo >Allargando > Grazioso or Largamente > Allargando > Repeat o3o
you wont ever run out of skills to spam.
Anyway imo like Jerry said masteries arent even that good ._. so leave them alone while your still low lvl and put them into the more worthwhile skills like maxing your two main attacks and partifur.
This build can pretty much solo full inter at lvl 150. (Given you don't lag and get trolled)