Sorry Btomlin, I was not jumping on you.
It is just these same issues keep coming up over and over again.

A person asks advice on the net. then in your case you state you gave them to a buddy to shoot and the buddy was not impressed with the stability . I am willing to bet since you had not shot them yet that you did not give him the tuning tips sheet that was included in the packaging. So he went out stuck on the nocks and had no idea about how the twisted nock effects arrow flight.

As to more devastating kills. You are missing the point .

A conventional arrow with a straight nock will get a broadhead spinning about 400 rpm 20yds away from the bow. A broadhead spinning at that speed usually makes a clean X entrance wound. The smaller your wound entrance and exits the less bleed out you get.

A TURBO NOCKED Arrow ( with that plastic thingy on the back) Leaves the bow depending on you bow speed between 7000 and 9000 rpms from most hunting setups.
When a 7000 rpm broadhead hits an animal you get a round entrance wound rathen than an X that can close easily.
Most of my staff shooters do not even glue the TURBO NOCKS in because they have found that usually the Nock will pop off and be laying within a few feet of where the blood trail starts. How many times have you made a tree stand shot late in the day and then got down on the ground and tried to figure where the deer was and if you hit it.
well If you see the plastic thingy laying on the ground and it is easy to see you have just proved you hit the deer and are very close to the blood trail.

Again I was not jumping on you , but trying to provide information on these type of questions which seem to come up quite a bit on the internet.