Hi Chris
I sail at Weston SC on Southampton water. Have a few years on you.
1. I weighed 80kg when I purchased my Aero about 15 months ago. Now weigh 76kg. All that sailing has an effect.
I have just the 7 rig, which is suitable for all condition on the sea.
2. The aero is not tippy, but you will have to move and anticipate gusts. Downwind just get your weight back.
3. I alway take the mast down to protect the carbon mast from UV, which was always a problem with my 800. Very quick to rig and de-rig.
4. We have three Aero's at Weston, you would be very welcome to join us.