AB2 combos have always been like that.
As a tip, if you go for two 6Cs, and charge the second 6C, you can pretty much control their height before the ender. But it pretty much requires that you do the high jump version. In this way, you can force it so only the 5th hit hits each time so you don't get the proration screwing over the ender. It's what I used to do in CS1. http://www.youtube.com/watch?v=SmNoBEINHMg#t=8m