I've had similar issues as a SMN trying to time actions out for Demi-Bahamut's Wyrmwaves. I'm much better at it now than I was, but I'm still not perfect as I usually miss a potential Wyrmwave from clicking a button too fast. It doesn't help that the cooldown for WW is sort of set at an awkward interval, either. At least I'm not launching all my attacks one immediately after the other anymore and missing like four of them lol.