I see no reason to actually bother with Expert and Highest Mastery. You really only need Beginner and Intermediate Mastery.
If you're trying to spam just one skill, like Allargando, you actually would need to have all 3 CD skills. Even with all 3 CD skills, I have to still use Grazioso at times. The combo is pretty much Allargando > Grazioso > Allargando > Grazioso > so on...
My skill build is like this:
Beginner Mastery (Max)
Magic Upgrade (Level 3)
Recover AP (Level 3)
Expand AP (Level 3)
Maestro Ultimate (Level 5)
General Attack Upgrade (Level 3)
Decrease Cool Time (Level 10)
Decrease Cool Time [Upgrade] (Level 10)
Decrease Cool Time [Master]
The build I gave is the end result of being level 193. This skill build was pretty effective at level 170 due to you having maxed out Prestissimo and Allargando. Made it a lot easier to solo Coli.
I feel that Wind Command is a useless skill. You should have a decent Wind Stone and Partitur already gives an additional 60 Wind Elemental and 40% Maximum Damage.