Hi Rocky
For two up cruising in 10 to 15 knots I wouldn't bother, for over 15 maybe.
For racing I am still divided, It would need to transfer super quick and the problem I see with the two-up scenario at the moment is not necessarily weight initially but the birds nest of halyards etc that no one has time to tidy up.
I still think the ballasting would be very good but it also needs to be absolutely idiot proof, when I've come up with that I will look at it all again because to do the system properly means building it into the hull (which for Shazza would mean taking of the deck bits we sit on and I'm not willing to take out the axe just yet)>
