So I'm working to try and increase my MNK dps as I am a ninja main and the jobs are so different. I played MNK a lot in 2.0 before I started learning ways to effectively dps so now I'm returning to the class and want to learn how to optimize. I have a few questions:

Should I wait til I hit GL3 to start using my ogcd skills to get more damage out of them? In a fight with lots of jumps and PB is on CD.
Also when bosses jump or I have to run to dodge an aoe, should I prioritize Meditate or form shifting? I've been form shifting but sometimes I really wanna get those stacks up.
How do you know when to drop tornado kick? A lot of bosses don't have telegraphed jumps, the only ones I know off the top of my head being Kalia, Ravana, Bismarck.

And lastly, is it really that huge of a dps loss when we lose GL3 due to a boss invulnerability? Obviously I'm gonna get back up ASAP but I've seen so many posts saying "It's gg on your dps when you lose GL3"

Thank you for your time