Mike –
What I like to do is firmly secure a loop of bite wire into the hook shank when I am first tying the fly. Compress it tightly so it just sticks out the back in a straight line, maybe half of the way to the tail end of the fly. Then, if you find you’re getting short strikes, take a heavy gauge, sharp hook like a Gamakatsu Octopus, generally a couple steps down from the main hook size (so like a size 2 stinger for a 1/0 EP fly).
Pass the metal bite wire loop through the eye of the hook, then open it up and slide the back end of the hook back through it. You’ll make an iron loop-to-loop connection and it ought to be stiff enough that the hook stays put. If it makes you nervous you can also thread a stiff piece of plastic tubing like for aquarium lines on the wire before you thread it, then jam that over your connection for added security.
Oh and I usually reverse the direction of the stinger so it sticks up rather than down; any hard chomps will push the stinger through the roof plate of their mouths and it won’t wobble out.
Zach