Fly_Amanita
Master of Caribou
You can afford to do the headbutt pretty quickly after the grab; there isn't much need to wait. If you do this, then you do need to delay the first tilt a bit, though.
My usual wobble input: grab -> wait a very brief amount of time, fairly close to a fourth of a second -> hit A (for the first headbutt and nothing else) -> wait about half a second (maybe a little less than that), during which time I slightly tilt the stick forward or down -> start hitting A at whatever rhythm I plan on wobbling at (I like doing it a little slower than most others, I think around 150bpm).
As for maintaining a wobble: make sure you can maintain a steady tempo. If you're messing up in the middle of a wobble, you're probably rushing or otherwise falling out of rhythm. This is one of the upsides of having a song in mind.
My usual wobble input: grab -> wait a very brief amount of time, fairly close to a fourth of a second -> hit A (for the first headbutt and nothing else) -> wait about half a second (maybe a little less than that), during which time I slightly tilt the stick forward or down -> start hitting A at whatever rhythm I plan on wobbling at (I like doing it a little slower than most others, I think around 150bpm).
As for maintaining a wobble: make sure you can maintain a steady tempo. If you're messing up in the middle of a wobble, you're probably rushing or otherwise falling out of rhythm. This is one of the upsides of having a song in mind.