Originally Posted by JDA_BTR
I usually put the screwdriver on "1" and let it stop at that.
I get that, but a setting of one is a big variable depending on what tool you are using to drive the screws. 1 on a small screw driver will be much different than 1 on a 20 V Dewalt Drill/Driver.
The speed that it is turning when the screw torques up will have an influence on how tight it gets with any given torque setting as well.
BTW, I think the plans specify AN525 screws on the cowl (though people tend to ignore that because they are not pretty)
The reason is that they are a structural screw so they have a smooth shank. This is much better for long term durability of the cowl. When threads of a screw are baring on fiberglass, coupled with vibration, it tends to work as a saw over time and enlarges the hole.
The AN525's are cad plated steel which doesn't strip out as easily as the softer stainless screws.