I'm getting ready to apply to clinical programs now so I'm not sure I can offer anything in way of advice, but I just wanted to disagree with this.
I've heard mixed things about emailing POIs, but I decided to go ahead with doing it anyway. It's only a waste of their time if you're emailing them with questions that are clearly answered on their or the program's website. For instance, I'm not contacting POIs that say they're taking a student on their lab website. One program has a list of accepting professors on their admissions page, so I'm not contacting those either. I am sending a concise paragraph to the ones that don't list that information. I'm already getting responses. So far I do have one professor that responsed with "I am definitely not taking a student for Fall 2015" and that's one less professor that I have to worry about. I have a couple programs that only have one or two professors I'd be a match for, so if they're both closed to incoming students then that's one application that I've saved. Only time will tell if it makes any difference.
As for the SOP, I've noticed that each program has different instructions and while most of them do have a lot of overlap, others ask for different things. I have one school asking for four separate essays on their application. My advice is to work out a rough draft, figure out what you want to say, and then personalize it for each school. At the very least you'll probably have to talk about the professors you want to work with and why you would be a good addition to their lab(s) and the program.
Also, start studying for the GRE early. I didn't and now I deeply regret it.