I personally prefer to slide from A to G and then hit L1 (A+B+K). It works very well for me. At first I could barely do ag:A right, so I prefered not to use it since it tended to result in NM doing A+B or a throw. For the longest time I thought I was doing it too slowly, but it appears it was the other way around. Problems arise when I input my A+B+K too early. The most important thing for me is to make sure my finger is off G completely before I hit L1.
So if you're having a lot of problems with it, maybe try doing it slower rather than faster.