The official pools that you've been mining to have too high a payment threshold, but I do believe they have paid out (I don't mind there). The Uspool is something like 100ETN before a payout!
With the difficulty getting harder, they need to reduce it in my opinion.

I'd suggest joining another pool and go back to the official one when they drop the payment threshold. You wont lose any ETNS at their pool. They just wait there until you start re-submitting shares again.

Ive been using http://pool.electroneum.space/#getting_started for the last few days just for the exact reason. They have just reduced the threshold to 1ETN.
Also the forum there is full of helpful people.