[Jon Stratis]

Keep in mind that the field is green, with a 2 inch wide stripe running down the middle of it, conveniently straight under the tower. Perhaps you can find some type of photosensor that can detect that line, let you know whey you're lined up correctly over it? Or you could mount the camera to the bot, feed the video back to the driver, and they can use the line as a reference in getting lined up.

All that said, I've found it's important to include as much "slop" as possible in FIRST robots. If something requires you to be in exactly the right position, it's not going to work during competition. The further from "ideal" position you can make it work, the better.