The timing is weird. There are kinds two ways I've found to do it..
You can hit the 33 really quickly after doing in to trait, then about when the second hit of the animation plays out, hit 2, then about in the middle of it's animation, hit your ender, be it D2 or throw.
The second way I've found is to keep s kind of rhythm. 3~3~2~Ender. You don't mash it out, or go particularly slow, it's like a metronome with an even pause between each hit.
I had trouble with it as well, but started to do 33 slight pause 2 slight pause ender.