I use the middle fees, it enable my transactions to be confirmed in a safe way, not so fast but it still can be confirmed 
That's clever, I used to use small fee so that some transactions can not be confirmed, I think I should change my mind now I would not mind using a low transaction fee. But this will do me a very long wait. That's why I also use the average commission. But even with this option, sometimes you have to wait a long time