sincerely, for some days I went to mine dogecoin on a big pool...  when h2o will decide to stabilize the whole situation, I'll surely come back.
I already disconnected all my machines from this too pool... Anyway, in the following days, I'll take a definitive decision

statistics are not good and do not help you to better understand what is happening...  too differences between us servers and eu servers for payouts, for statistics and for immature coins..