Slightly off topic but all the same about the mining pools:
could someone tell me a good article or a good explanation on how to handle txfee on all these pools.
How do you choose the right level of automatic payment so that it does not cost too much depending on its mining power?
What is the difference between TxFee in percentages and that in fixed rate? When do I have to transfer to minimize all these fees?
different pool different rate at the different time/amount.
You can find those infos easily on most pools.
Of course, you should always go for no fee or the smallest amount, so if you can wait , delay de payments/transfer.