Fluid Driving Instanced Object Aim Direction Problem

[lostcat]

Hi guys,
here's the deal,
Im driving particles with instanced objects (fishes) using a 3d fluid
I gave a very slow simulation rate and small amount of turbulence to the fluid so my fishes can swim slowly. The aim direction of the fish instances is driven by the velocity of the fluid.

But from time to time, some of them will move heratically, caught in some bad vortex or something....
Ive played with the conserve and dynamic weight attributes of the particles but the problem still remains.
Im looking for a way to stabilized the particles aim direction.
Since it all depends of the velocity of the fluids, how could I average this value so the fishes rotate smoothly when they turn?

[lostcat]

I have increased the resolution of the container grids, it seems to help! I still get a few fishes that turns too drastically though and there is still a few of them cought in these vortex that make them move heratically it's much better, but not perfect!!!