Thanks Anvart by the input. Yesterday I tried a bit more, using all approachs that I could imaginate...just to find that Sh3 uses some type of Einstein's Quantic phisics for sky/skyobjects as the particles conditions are always true: don't exist heigh, below, water tests don't work, the particles are always in all places!!
So, I really guess that isn't possible to have a good solution only with the sh3 controllers. Well, at least for now.
Cheers!
Rubini.