I do the same thing, but ... in some random order:

1) I try to use ZIP submits when possible, better conversions.
2) I post all ads myself, they stick longer. I wrote a program to add random words to the end of my post, took the time creating ads down by about 80%.
3) I switch emails twice a day, about 20 or so ads per email. I never change IP, and I have been doing this over a month. I also change the domain of the URL every 15 days or so, this helps from getting ghosted and blocked.
4) Test different categories and offers. Free stuff gets flagged fast, but other sections stay up for a very long time.
5) I put up about 4-5 ads for the same product in one spirt, than wait at least 1/2 hour before putting up more for the product.
6) Check time zones. Don't post in New York when it is 11:00PM Eastern time, post in California where it is 8:00.
7) Copy is the key. I was getting decent conversions, then actually worked on my copy, boom, doubled my conversions. Some offers need a decent copy, some don't. I have 2 offers that are doing great now that are just urls, and I have a few more that are about 1 paragraph.

I am working on a program to "automate " manual ad creation more, with all the cities listed by popularity, web browser, blah blah. It will be in the BST section hopefully by the end of the month.