Hi there, so I would change the foil before the wing, as you are pretty light/1750 is a big front wing for your weight and level. At 20knots with the Aero Free 1000 and a 5.0, you should be pretty ok - and you will end up using the 1000 all the time anyway as your level improves - I'm 78kg and it's my most used wing, between 4 and 6sqm...