And the 139 comes out the best - 15000 lbs (approx without supplemental increase to 7000Kg), disc 54' 8" - disc loading 6.37 lbs/sq ft.
It certainly seems clear from a downwash point of view that the 139 is the best option from the Leonardo stable for coastal SAR - oh wait, isn't that what was used when the 189s weren't available?
I like the 169 from a size perspective but it comes in at 9.5 lbs/sq ft - however, being less than 2/3 of the mass of the 189 it would have far less downdraught.