In regards of the CTR, being banned by high CTR is mere bullshit.
Many noobs don't realize this, it's pretty impossible to get an average 20% CTR across all your sites if they're all legit & filled with valuable & engaging content.
The higher the volume, the lower the CTR is going to be.
The only way to achieve this is to use some ugly ass xfactor type templates with some boring text with no added pictures/videos/outgoing links to related sites.. or when you're doing some deceptive shit like what the OP has done, which is exactly what Google hates.
Obviously, accounts with high CTR are going to be on their radar. It's one of the easiest factors to check if you're doing anything shady. They don't even need a bot for that.
Having said that, I'm still not convinced that using the same theme for all your sites and having 5 pages of content would get you in trouble.
Check out AdsenseFlippers, they've built hundreds of 5 pagers using the same theme with no problems whatsoever. Even the Adsense reps are aware of their business model. It's all about the quality.