If you only normally make a 10% profit for 100% luck, then September profit was over 400% of your usual profit.
i.e. if you normally make 10% of 100% then your costs are of course 90%, so Sept was 134% - 90% = 44%
and since you normally make 10% that's 4.4 times your normal profit so 440% of your normal profit in September.
Simple math - though usually it requires a little accounting understanding.
Total/Gross income doesn't mean much, it's Net that matters

Anyway, as rifleman pointed out and can be seen I specifically stated

If luck evens out 100%, then you OBVIOUSLY need to take the good with the bad ...
Anyway, with the price dropping to about half, unless you were doing better than 50% as profit, that would mean you're losing money no matter what - so the pool luck isn't much of an excuse anyway.