I always stack/pull around the 0:53-0:54 mark, seems to work best. You want to be in position around the 0:50 second mark, that helps you not waste time out of lane and gives you enough time to scope out the situation in case you need to abort your pulling/stacking.
Edit: I actually haven't played dota 2 much since the cygnus revamp, but i'm going on now to see if i can get some fun games in. Anyone else notice how hard random games are sometimes lol, it's the only mode i play because i've been playing so long i just can't pick a hero after playing all of them for 7+ years, and the fact that you tend not to get picking constantly trying to counter pick your team making the game stacked and a waste of time.
Edit: I actually haven't played dota 2 much since the cygnus revamp, but i'm going on now to see if i can get some fun games in. Anyone else notice how hard random games are sometimes lol, it's the only mode i play because i've been playing so long i just can't pick a hero after playing all of them for 7+ years, and the fact that you tend not to get picking constantly trying to counter pick your team making the game stacked and a waste of time.