Best advice I got (for more technical boats)

Get a little booklet and write down a one page (short and pointy) report one each race day. About what your tune and trim settings were. What worked and what didn't work. What felt good and what felt bad.

You can really get your boat dialed in that way. And when ever conditions repeat themselfs you can look up what worked and what didn't on the other (similar) day.

I especially found this approach helpful on my more technical Formula 16 boat I guess things are exactly the same on boats like F18's, A-cats and I-20's



Other advice that worked for me :

Always look for and sail to clean air. Don't be afraid to tack away or tack late if the layline is crowded. Having clean air and a clear route to the A-mark is more important. Especially in light winds where dirty air can really kill boat speed.

In shifty and variable winds look where (most of) the leaders go and go to the same side of the course while keeping clean air.