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It's bad when several tournaments are held simultaneously; it can lead to quite predictable confusion (the system is designed for one tournament), and you just stand by and calmly observe the chaos – it's not right.
So, why can't the rating be calculated for each SEPARATE tournament? Why invent a system for calculating the rating for several tournaments at once? What's the point? Wouldn't it be simpler to just add up the ratings after each one is calculated?
Iron, why not 99 to 1? :), did you check and calculate in the case of 70/30?
"Единственное, что можно сказать с уверенностью об удаче - она изменит..."