I dunno about the fiberglass laminates, but you're a little off in the selfbow part there...are they slower or faster than other bows
Osage is a average speed wood, tough, very good wood
If you had a 60 LB bow osage 160 FPS
Yew same pounds and length 170 FPS but much more fragile.
Built a few and did a lot of crono checking, 66 to 68 is a good length , shorter and same pounds will shoot faster but not as easy to shoot..
what Makes a self bow shoot well is when at its full draw that the shape of the limbs look like a c shape, if the limbs are flat looking won't be as fast or good shooting, the last 15 inchs on both ends should be tapered in to a small nock, wide flat limbs at this point have more weight and bulk to spring forward loosing speed and causing hand shock
the lighter the wood the faster the bow, less mass to go forward, Made a few hundred laminated bows, same thing but the osage was slower than Say Yew,Red cedar, Walnut and some others were all faster.
When it comes down to it after fooling around for 20 or so years, In a self bow speed is not that important, around 160 FPS is almost Ideal, 155 to 165 FPS is good for shooting instinct, very hard to shoot instinct with a bow aproaching 200 FPS, brain has a hard time with the drop at close range like 20 yds
Thats My 2 cent's and I am sticking by it