It is hard to have the mast of a lug too stiff if you are trying to control sail shape with luff tension. On my rig on Dias's Harrier design we have a low stretch halyard and an efficient 4 part down haul. The carbon mast is twice as stiff as the hollow wooden mast that Dias designed and it is scheduled for a trip to the braiding machine this winter for another couple of layers.
I have the leech telltales that Todd uses as well as a set about a foot to 18" back from the luff that seem to be useful sailing up wind.
The easiest way to reinforce a wooden mast with glass or carbon is first to try some unidirectional running up the mast maybe 4 strips. If that is not enough think of the mast as a mandrel and wrap it with glass or carbon "tape". A rolling table is sometimes used for this.
The interesting challenge for hollow wooden spar builders is to copy the old canoe masts which were 5 layers of 1/32" veneer. Each layer was angled about 10 -15 degrees off center so wide veneers were not needed. Hide glues held it all together.
Ran Tan, Leste Kuhling, Vernon Langille, Josef W., Merry Mouth, Imp, Macavity and a quiver of unamed 'yaks.
"Bound fast is boatless man."