How did you get to that 1000 with 451+ in 20 days. Shouldn't it be more than that.
If you look at the May 1st draw, the score was at 450, basically no profiles with 451+ right after the draw. Based on the pool distribution as of May 10, we have 1985 profiles with 451+ score from May 1 to May 10 (9 days).
That's like 220 profiles/day with 451+ score added to the pool.
Now if we have another draw on 29th, that's a gap of 19 days. That 1000 profiles between May 10 to May 29 (19 days) is extremely optimistic.
Edit: The scores of 450+ could be skewed towards low the 450s, which would bring it towards 450 - 455. Else, you would see a cut off between 455 - 460.