After some water trial runs it was too risky for water getting inside nacelle air intakes, being too low! Ripped them out and replaced them 4" higher and 2" forward to get more water clearance.
The first flight after this mod was bit of a handful compare to my original set up, so further experimental trial&error test flights on the way to sort out the instability problem.
Just love the challenge.
Replacement of EDF module to higher position.
Minor mod to get more salt water clearance.
New EDF module position.
Bit of handful the first flight, but only time will tell.