A bigger front wing and smaller kites, will give you way more range.
Because you can start earlier, and when wind picks up the wing has drag so it does not accelerate - meaning too much power and speed.
Only thing is, when you feel it lifts too much (assume it is the Curve M you got, the smallest), maybe you have to get a thinner wing, or smaller, for your 70 kg.
But if you did not have this issue - bigger wing smaller kite gives you more range as said, a lot in my experience.
Do you use the smallest possible stab?
That will also make the foil a lot more fun, and remove the front foot pressure.
But at your weight I assume you are using the 210-220 cm2 stab?
Peter