Adsense Optimization

I recently put adsense into a site I help out with and have seen some really good data coming through. I have read a handful of threads on BHW that really helped me out but I want to optimize this thing even more. So here is what I have done so far:

• Turned off Interest-based ads
• Found 4 low-paying advertising networks, that have served us ads and have turned them off
• Altered Meta tags to target my niche
• Altered Title tag to target my niche
• adding more relevant content to further target my niche

Couple of questions that I have for other fellow BHW members

• What is a the average CTR?
• What is the average CPC?
• Should I find a list of low paying advertisers and kill all of them? Or is there a possibility that their ads will pay higher on my site?
• I have seen some adnetworks come across like shown below, what does it mean? [TABLE="class: grid, width: 934"]
  [TR]
  [TD="class: asfe-DynamicTableCell"]AdRoll.com[/TD]
  [TD="class: asfe-DynamicTableCell"]
  1​
  [/TD]
  [TD="class: asfe-DynamicTableCell"]
  100.00%​
  [/TD]
  [TD="class: asfe-DynamicTableCell"]
  0​
  [/TD]
  [TD="class: asfe-DynamicTableCell"]
  0.00%​
  [/TD]
  [TD="class: asfe-DynamicTableCell"]
  ?​
  [/TD]
  [TD="class: asfe-DynamicTableCell"]
  $0.00​
  [/TD]
  [TD="class: asfe-DynamicTableCell"]
  $0.00​
  [/TD]
  [/TR]
  [/TABLE]
• What else can I do to further optimize this?

Your CTR is going to directly correlate to where your traffic is coming from and whether your niche has highly relevant advertisers. I've built a site with a CTR as below 1% and I've also built sites with a CTR average well over 20%.

Cool, thanks for the info.