Well I personally have never shot a deer with a Shockwave. And I have sure read a lot of horror stories just like what you are saying. But then I have seen deer shot with a 30-06 that did not bleed for 50 yards. After that of course, a blind person could have followed the trail.
You just never know what a wound is going to do until you find the deer. High shots, unless you are breaking a deer down, are dangerous to make and not always fatal. If you're not going to break the animal down, do a low heart shot. You know then that the deer is not going to run for miles, and with a low hit, they start to bleed sooner.