Just make an faq on your site and say something like....
DUE TO THE HEAVY DEMAND AND RESPONSE RATE, PLEASE READ THE FOLLOWING FAQ TO SPEED UP YOUR ENROLLMENT PROCESS
Something like that. Then include those questions you keep getting and add the answers.
AND...be sure to let people know, ClixSense does have 'checks' as an option.
You'll probably get more sign ups if you do that. For one, it places a subconscious level of 'everyone is signing up so i better too' and secondly it puts the 'i better read the faq first so i can get signed up faster' in their head.