1. use different g-mail addresses
2. use internet explorer for this site
3. use ccleaner or equal software to clean all the junk files between offers
4. check for verification e-mails
5. always use honest information, maybe excluding honest phone, too many wasteful calls
6. really it is ideal not to use a form-filler like roboform, some people do, but it has been proven to lower the rate of approval a bit due to new cgi script technology tracking
7. be patient when doing the offers, in the long run you will see a higher percentage of approvals, maybe even wait a while between offers
8. see offer help threads and really pay attention to those that have high-dollar amounts in their banners, obviously they know what they are doing :-)
i'm not saying you need to do this exactly, but it gives you an idea of how to go about it, and seeing as how over the past couple years i've had over 1,000 offers approve with various sites, it seems as if those tips are the sum of my efforts