A few considerations that I want to share with you about the new policies:

Old mining hardware (~5Th/s) is not performing anymore. If we do apply the new rules to new accounts only, older accounts will receive only a few small payouts because the hardware gets obsoleted too fast following the mining difficulty increase.

The solution I thougth to this problem, is to dedicate as much hashing power as possible to new accounts, so they will be able to become completed quickly. If the difficulty increase doesn't bring us new surprises, the hardware will still be profitable for a little longer, and older accounts will be able to get payouts. It should be fair because it encourages new deposits, and it will help older ones.

About the additional bonus for the oldest 10 accounts, I chose 10 because only a few accounts have large amounts absorbing all those bonuses. The only alternative I can think of, to improve this, is to split the mined amount of the hardware not bound to any deposit (the hashing power of completed accounts) in equal parts (not depending on the hashing power) and assign it to all the "old" accounts. While the first rule would benefit oldest deposits (those who waited more than others), the second would benefit smaller deposits because they will be completed first and everyone will get payouts starting from day 1.