Hi again Oldhorse,
I was looking on the forum archives, and I was wondering exactly which board you
What I said before would apply pretty much to the 2004 Formula 138; Free Formula 138 and the 2005 F-Type 138.
If you are using a fin smaller than the one provided with the board this could affect the upwind performance.
Also, what do you weigh (Kg./Lbs.)?
Hope this helps,