bigheat:
Purposefulness and economy of information in your communications are much more important than quantity of information.
Try to put yourself in the coaches' shoes. What would you want to know about an interested recruit if you were besieged with information from a bunch of players; especially when it's obvious that much of what you're receiving is blasted out in general form to many other coaches, as well?
Well, first of all, they need to know of your interest in them. Try to communicate not only the fact that you're interested, but WHY you're interested in them, specifically.
They need to know some factual information about you. Complete their questionnaire and return it if you have it. If you feel that their questionnaire fails to adequately capture some important dimensions and/or accomplishments, whether on or off the field, don't hesitate to add that information on an additional page. If you don't have their questionnaire, send them a fact sheet that details many of the items that a typical college questionnaire contains.
They need to know where and when they can see you perform. As a result, it's often a good idea to send your game/showcase schedule to them before each season.
With the first two items in hand, they'll begin to know whether it makes sense for them to make their interest a mutual thing by looking at your video and/or coming to see you play.
Best of luck to you!