Guys is ethermine.org still one of the go to pools for ethereum mining?
I always have about 96% accepted shares and 4% stale shares .. ? Why 4%? Is that the miner fee?
What does stale mean in this relation?
No its not a miner fee, there are some factors on stale shares most probably is the latency of pool, check your mining pool location, choose the nearest to you to decrease latency, also check your connectivity, stable connection is the key.
I mean the weekly outcome is good but slightly below of the whattomine calculation with my "reported" hashrate from my rigs.
All rigs perfectly stable since the last restart one week ago. No disconnects, restarts, etc.
Any help or info for me?
Thanks a lot!
Have you heard about Difficulty?

it may cause your outcome for being not stable