Sorry to hear that you gave up on your ducks. I fully understand about the stink. It took me 6 months to get my pens set up like I want. There sure require room service. The Ducks want every thing clean but their reputations is messy.
I have an over night 10 by 15 ventilated pen and lots of clean grass clippings., a 10 by 15 out side-feed and water pool ( 2 tubs bought for cement mixing at $5.00 at Lowes ) then two small pasture`s with netting over it.I have rubber mats in that water area so I can hose it down twice a day. We dug a small hole on the South side of the pen, out side of their pen for the water to run in when I hose it down. There is no stink that way. Their poop is instant fertilizer and since I added some bentonite by accident no fly`s are there either. I never considered stink, when I decided to hose it down but just wanted them to have clean water sever times a day. Since it is warmer weather, I have noticed the stink before I hose it down.
During the day, I have all the pens open o them to roam. The pastured get irrigated by sprinklers which also takes care of their waste in there. I have 6 ducks for laying. One is a Khaki Campbell and I hope to find more Khaki hens, that would be my choice of duck for egg laying. I am allergic to chicken eggs and ducks eggs are very agreeable . I have all hens , no drakes. Their eggs are alkaline and chicken eggs are acid. I love my ducks,and could never eat them either.