Zorab,
I fully understand why NPAS went for the 6/4/7/4 and support everything you've posted above. It was important to us at the time that we kept the 3 week cycle but opted for 6/4/7/4 as the least worst on offer. Don't know yet if the latest "tweak" will change anything other than closing the changeover gap. I still find having my sleep pattern changed twice in 21 days, rather than once, and always finishing on a late to be very tiring and very poor for work life balance - no matter how "legal" it might be.