I have been setting up one squeeze every 2-2.5 weeks for about 2 months now and am currently using safelists/credit-based 'taes', Twitter, and JV giveaways to promote my squeeze page(s). But it seems to be that the results are almost the same irregardless of what I alter (other than the headline).
I have programmed a PHP script to instantly alter certain areas of the page itself with a few predetermined 'schemas'; but ultimately I gather more information from behavior observation.
Any ideas? just basic stuff...