Creativity Rewards Program $4000 Limit?

Over the past 2 months i have made $4000 within the first week of the month. HOWEVER as soon as i around $3000, even though my videos after getting that first $3000 have the EXACT SAME IF NOT BETTER STATS, my RPM takes a huge dive.

Beginning of April every vid RPM was 1.10-1.35 -- but now it is .14/vid. And last month I was hype because I was projecting $12,000 based on my original rpm of 1.21 but then it just kept dropping the more views I got, ending at $.46

But after this is my 2nd month in it I am just realizing there is basically a HUGE diminishing return once you are already at around $4000 for the month. My RPM has gone down a whole $.07 in the past 3 days and I haven't even posted. Anyone else feeling it basically pointless to post after you reach this threshold?

I remember last month I only made like $700 on the last 6mil views after I reached the $4000 mark after the inital $4000 was on approx 5mil views.