Are you sure your slip editing correctly if your using a macro? I use cubase, but the method should be similar, and it wouldn't be the same if the cuts were made before or automatically.
As far as choppy-ness goes, I tend to get that when the part wasn't played very well. Using the high hat example, if the high hat rhythm and the kick/ snare hits are off of each other, if you just line up the kick and snare hits, the high hat is going to be doing some very funky stuff, including sounding chopped. It helps if you pay attention to what the high hat and cymbals are doing while you are editing so you don't chop off the attack, or accidentally double the attack (and get a glitch sound). You could also line up cymbal and high hat hits in gaps with no kick/ snare so the edited drums sound smoother and more in time with itself. It's the intricate cymbal work while you are slip editing drums that makes not using macros so important, because the computer will only see what the shelled drums are doing.