How to Make More Money with CPL's?

Hey, guys. I've been promoting CPA offers and getting some positive results. However, I'd like to learn how to really rock with these things. Here's what I do to pick up the best offer from a CPA network I belong. I don't focus on the payout, first and foremost I take a look at the EPC and conversion rate of the offer. So, for instance, I come across an offer with $3 EPC and 10% CR ($30 payout per credit card submit) in health niche. Sounds impressive. I think "Oh, really?". Next I go to the landing page of the company, learn what they have to offer, why people should take action and audit the page to estimate its real conversions. If I think it sucks, then I don't trust the stats provided by the CPA network and skip this offer. If I see a serious potential in it, I bookmark this offer. Next I go to Bing Ads and conduct a keyword research. I start it with checking out the best keywords that fit in the offer. If I see that I can bid $0,3 per click when the EPC of the offer is $3, it tells me that it's possible to make 10 times more money than invested. So I create 10 ad campaigns to test the offer and run them for a day or two. Later I delete those ads that deliver below 25% ROI and increase the budget on winning campaigns. If I get a very low traffic volume, I keep waiting. What else can you advise me to do to make it work better? Thanks.