Profiting from contract settlements

I recently came across another thread on a different website. Here the poster claimed to have repeated made money selling the Cad/US at the end of every month. He even claimed 95% success
he stated:

FACT 1...Canada is one of the world's largest oil producers
FACT 2...Canada the top exporter of oil and other petroleum products to the United States
FACT 3...end-of-month oil contract settlement
FACT 4...it is well-known that oil futures settle in the final week of every month

now this got me thinking about situations like this. I remember Henry Lui claimed to be able to make a profit from a certain Wednesday with Japan settling contracts.

There must be a certain day/week in each month where certain contracts or orders have to be filled. a bit of research could determine weather these times lead to better market predictability. Anyone know of any? or use any now?

p.s. the cad/us sell broke even this month

I suppose this is like the last week for JPY. Its the end of the financial year so divisions abroad are repatriating their profits back to japan and so the JPY gets bought up, hence the slight fall in USDJPY even in the strong uptrend.