Two parallel questions to get community feedback.
- Maximum 50 posts per week is good enough or 40 per week is better?
- Would you like to have $250 or $200 per week?
What you did for YoMix is good, however the approach you take for this campaign depends on first of all your participants. Are your participants making more high quality posts compared to similar campaigns? If so, give them larger reward, such as $250.
I have never seen any campaign have a 50 post limit since Chipmixer, and that's because you will literally have to spend several hours each week to reach the quota with good posts, so this may strain your participants. 40 is in line with the other campaigns.