Oh! I'd never do that!
They actually asked us (my dept) if we had recommendations in the matter, while they go along with their own research.
It so happens that the new guy to AIX was happy to look into something strange
Coming back to the memory issue, there's a late update to be made. I few hours ago I found a important piece of information which I should have assured from the begging...
The oracle instance in this box is
inactive
Darn... There goes my theory of how Oracle's recommendations would save the world....