Bottom line is that if the leads don't back out for the advertiser then you won't get paid, unless they investigate and find out that you're not doing anything shady. If you want to do offers where they're genuinely collecting leads and will contact them for offers later, you have to mix in converting traffic for the advertiser...like 70% in order to stay under the radar.
As for adjusting the CTR for email offers, just send fake clicks to it through a traffic broker like buy hits cheap or someone that sends US (whatever country the offer is for) traffic.