I like to use 95W myself, because it's such a strong signal. What I would do (if you want to play around before dark sets in) is be a little less scientific... If everything looks lined up properly, drive the motor to the satellite you're looking for 97 or 95, etc. Make sure the parameters of the transponder are entered in your receiver. Then, manually (not with the receiver and motor) loosen the motor mount a bit so you can swing it left to right by a centimeter or so at a time. Do this very slowly. Many times, it is easy to misjudge the location of the satellites on the arc. When I was setting up my brother's system, I was surprised how far west I was from 95W! I swung it somewhat in frustration back to the east and slowly moved it west and I locked on it. (Yes, you'll need your receiver and TV out at the dish for this, or have a person or webcam somehow show you when you hit the satellite!)
PS -- sometimes when you get a slightly better signal, but no picture at all, it means you're on a different satellite. You can try doing a blind scan in those cases to see what it picks up, then judge which satellite you're picking up from The List or Lyngsat. Still, this isn't such a reliable method (not to mention it's very time consuming) as the one we've been describing!