It was not 300/day, a total of 1,079 joined between last draw and yesterday in the 470+. The difference between the total 470+ in the last draw and that of yesterday will give you the right answer. 300/day simply means over 3,000 persons joined, which is not the case
Yes, I do agree that 300 candidates would need some extrapolation, so you're correct. Yet, let's do some math:
On draw 155, there was 7656 candidates with 470-1200 points
Them, IRCC invited 3900, putting that number down -3900.
The following draw, it invited again 3900 candidates, but of course not all 3900 ITAs went to 470+ candidates, since it was a PNP/CEC draw, so let's assume 50% went to 470+ candidates... so that number went -1950.
According to data provided by IRCC yesterday, now the 470-1200 range has 6860.
So: 7656-3900-1900 + X = 6860
X = 5004 candidates added in the pool between July 6th and August 4th.
So, it gives an average of 172 candidates/day added to the 470+ range daily during the month of July.
If we consider just the last 2 draws (which I don't think is ideal, since I believe the delta should be between General Draws):
Draw 156-157 (PNP/CEC): there was 5781 candidates with 470+, and let's assume 50% of the ITAs went to 470+ candidates.
Draw 158: 6860 candidates in the pool
5781 - (3900/2) + X = 6860
X= 3029
So, yes, around 3,000 people joined the pool between each draw, but since the difference in days between each data point is 18 days, the actual rate is: 168 candidates/day.
So, yes, working with 300 would be an overestimate, but working with +300 during 2 weeks is WAYYYY below the reality as well.
Ideally, people should work between 150-200 candidates/day as a good guess.