Robi,

One the best advice ever given to me was to get a little notebook and make a short sailing report each time after I went out. Note down boat trim and settings and how the sailing went. Only change 1 or 2 things to the boat between reports and test sail it thorough with the new settings. This way you hone in on the right way of sailing and tuning the boat in a quick and easy way. This way it is very methodical. It really works.

You should try that as well.

Wouter