10 years ago people would have killed to be able to do that in A:M! I like the way the pool spreads. There may be a way to get the jitter to stop but I haven't investigate fluids greatly yet.
However, 5cm seems large for a fluid particle, that's like 2 inches. I'd try smaller, which may mean more particles are needed.
Fluids particles do well for when the fluid is falling and splashing, but are not as well suited to bodies of water that have come to rest. Some slight-of-hand transition to a traditional model might serve better for that.