ah good point (no pun intended). Obviously the most at risk portion will be the fin tip, which you could reinforce by not tapering the fin tip to a point. Basically, keep the airfoil shape at the tip. The drag increase would be minute. You could even put symmetric winglets (oh boy the college memories are coming back now lol) on the ends for added strength. That's going to increase drag slightly and affect the center or pressure slightly aft as the fins would be more efficient at producing "lift". Manufacturing is definitely harder tho.I’m worried about this too. Reinforcing the trailing edge was the impetus for including a G10 plate in the core of the fin. That being said, I have also broken off knife-edge G10 fin tips during normal wear-and-tear.