Don't just focus on the time periods. I take a few hours to write every story too, but I think I do justice to those hours, and I haven't even enrolled in the partner program. I think one 20+ articles in a month is enough and you don't need to speed up to write 50. It won't be of any real help, in terms of honing the craft, at least. I am here because I can't stay away from reading, books and writing, and I need to share that. My best wishes to you.

p.s. I had a slump from february to May too, and I have written 53 articles in 42 days after that, so I hope you can too.