Like some others here I see that captcha visibility is an issue. I set up a test site and created several forms trying to get a fairly readable captcha. I set noise to low and none and played with other variables but it never comes out clear. You obviously don't use you pwn product to create the captcha used to ask this question, it is very clear and easy to read. Perhaps you could tell us what product you use or let me know the settings to get a clear captcha.