I realize this is a little late but w/e ^_^ just found my way here somehow
Here's white 2 single-beat (I never practiced half-beat):
I was struggling with it for quite a while but the key is to have a good cj, at least 540+ although it's doable with less.
White 1 is _a lot_ easier than white 2. If you can't do white 1 easily you need to practice more :P before doing white 2. Black 2 is also harder than white 1, and I have more trouble with it than white 2 also. The issue is that the first pad is so close that it's hard to get a good cj, but the 2nd pad is still quite far. I can't use my normal technique on it.