I think we need to have HALF of the vstab be destructable, and you have to lose the other half before you totally lose control. You see many war pictures of planes with most (if not all) of their rudder AND stabilizer shot off, and yet they still flew back home and landed. I remember seeing a B17 pic with ALL of the tail and stab gone, and just maybe a 2 feet long 4 feet tall leading edge left. The bomber landed.
As it is now, the INSTANT you lose one you're flopping around like a fish. I never liked that aspect of AH. Need more degrees of destruction. Heck! We've got 3 parts of the wing that can rip off, but only 1 part of the vstab!
EDIT: In AH (at least) you can lose H stabs and still have rudder and vstab. It happens a lot. Just this week I blew the Hstabs off a hurricane, and left the rest of it untouched.