I would suggest you not use your hotshot method with any cattle with Flush in them, they have a way of paying you back. Like when you get them out in the open heading for the ring and they look at you and seem to say "remember that time you hit me with the hotshot, now lets see if you can keep up".
My uncle told us about a guy who used to work on a big Char ranch, this guy was about 5 foot tall with his boots on and he halter broke all the bull calves, he would break them to tie and them break them to lead. He used a tractor with a rig that attached to the 3 point hookup, it was a bar that had 6 rings on it. He would tie 6 bulls to it and lead them around a plowed field, the key was the calves had been handled prior to hooking to the tractor and the guy that was working them was the one that fed, rinsed, groomed and handled them through the entire process process. He had their trust, and he was ornery enough when needed to have he would earn their respect. Some one drove the tractor and he set right in front of the calves (yearlings) so the could see him. They did not drag them, they led them, big difference.
I can see getting tough when you have tried everything else, put if the heifer has been doing fine and is having a bad day, I do not think I would resort to drastic messsures yet. Had a steer that would lead fine, one day he acted similar to your heifer, turns out he had kidney stones or the equivalent, once we got him right, he would lead fine. Should we have hit him with a hot shot, drug him with a tractor, or doctored him. We chose the latter it worked for our situation.
It is fine to have different methods and techniques for working and breaking cattle, but if someone disagrees with the way you do it, that does not mean you need to attack them. I prefer to work with cattle that have been broke with patience and time then cattle that have been broke with force and pain. My reason, when you get into a situation that is not ideal and the cattle spook I have found that the calves that trust you will usually calm down faster, than the ones who fear you. JMO