If the tongue weight is too much, the vehicle front wheels will be lightly loaded.
If the tongue weight is too little, the trailer will tend to "fishtail" going over 40 mph.
Basically, you want to have 10% of the total weight on the trailer hitch — 300 lbs in round numbers.
My Capri wing keel sits just in front of the single axle.
Now I don't have a Capri-22, but, my Catalina-22 MK-II version shares the same wing keel with the Capri-22 wing keel versions. I also trailer with a single axle Trail-Rite trailer. So hopefully you can see the position of the wing keel with the boat on the trailer.