For me(65kg) it's the other way around.
I LOVE the AMP11.9. It has a huge range. Measured range 8-22 knots!
Not more then often it's the first kite that gets going and boost high
(light winds SS SX141,,,,stronger winds SS Misty137)
With the smaller AMP's, yes I miss depower. I take a smaller size earlier. For me the AMP8.7 and 7.1 do not have a huge range as the AMP11.9.
For real strong winds an Hydro5 2002 is excellent in depower.
My mate weighs about 75kg and finds depower of the AMP's excellent also the smaller sizes. So only 10kg makes a big difference in the smaller sizes.
So option 2 and perhaps 4.
Grab a board that can hold an edge and you should be fine for the AMP11.9. For the smaller sizes perhaps a less grunty kite is better.
For now I'd say that in 2004 I will keep my AMP11.9(16.2 flat) and get less grunty kites in size 12 and smaller. Also for my feel of safety. I can hold the smaller AMP's quit long but I do not feel safe then. No margin for error except for using the leash...