Thanks for sharing your experience. I have red your advices with great interest since you describe a similar business to mine except that my business is a company Ltd.
I have some questions out of curiosity -
1. When have you started and when did you realize that you can make a living out of Google Adsense.
2. Do you still update your current content (improving it), Do you add content on a regular basis?
3. Isn't it be better to have one and only website, which is easy to control and develop than many.
4. Are you still depended on Google organic search (will you survive if G drop your traffic to zero)?