I think that's way too early to start you swing. I start all my batter pretty much the same - right before or during the release of the pitch from the pitcher's hand.
I will keep my eye focused on the pitcher's hat and when he's about half way through his windup I shift my eyes to look in the zone of where's he's going to be releasing the pitch. Once I see the the ball in his hand within that zone is when I start my pre-load (push down on the RS). Even if I take a pitch, I will release the RS so I can see how my stride timing is. I'm usually 'Normal' or 'Perfect' on AS & HoF (haven't tried Legend yet).
I recommend taking an inning or two and just watching pitching and practicing your RS movement/timing. This really helped me get feel for each batter and I am not of the opinion that there is a HUGE difference in timing between a guy like Torres and Posey. There is a slight difference, but it's not seconds different, IMO. I think hitting is very much feel based this year which I love - especially when batting with guys who have a fluid movement pre-pitch.
Hope that helps.