Going hard upwind
- you "could" adjust your lines if you have adjustables
- you could have a second set of shorter lines on your boom
- you could just do what some other people do and adjust your stance (a 7 is NOT always optimal). I go faster and harder upwind than all the other regulars and tourist blokes here with longer lines AND they are max 1 handwith apart (smaller sails lines tend to almost touch).
Hanging hard from your boom also give you the ability to plane through really bad lulls.
The waist harness really engances this.
This argument sounds a bit like you should look like this... funnny the pros don't, oh well never mind...