I would avoid Creative Nation. I partnered one of my channels with them since May and in September they told me they suspended all future payments due to copyright issue. But my channel only had a few third party matches - no copyright strike at all and the channel was at perfectly good standing. So they basically just decided to refuse paying me while they still earn from my videos. So I left.
I also have 2 other channels partnered with Vultra & Curse. No problem with either networks ever. Vultra used to be 3 year contract @ 50% pay but now it's 1 year contract and the pay is dependent on your subscribers. If you have 10k subs it raises you to 60%, 20k subs 70%, 100k subs 80%. 1m sub 90%. And their CPM is the highest of all 3 networks I tried so it's not bad imo. Curse is great too - 90% with no lock-in contract but more difficult to get in I believe.
EDIT: Just read the sticky thread regarding proof. So here it is:
1. E-mail from Creative Nation:
2. My channel page showing no copyright strike and in good standing:
3. My copyright notice page showing only 2 videos with third party matches, no copyright strike or world-wide block: