As soon as the word ferry is mentioned forget anything the OEM has said about both performance and how its should work.
its CofG will be way out, its weight will be way out.
Personally anything that has been ferried I would be extremely suspect of stress strain history.
Once watched a C172 take off with the whole of the rear cabin full of fuel for a trans atlantic. Plus raft and all the rest of the gubbins.
Used the whole length of a 2000m runway at sea level and 10degs C and then limped into the air and climbed away at 50-100ft rate of climb.