I have JT's wrench, and it's a stout piece of tooling.
And BTW, I batted .500 in luck department on my ST. One nut came off the first time, and the other had to be cut free as described above. Even heat wouldn't persuade it.
And always keep in mind that yes you can always put enough torque to the wrench to get the nut off, but at some point it may bring the threads from the head along with it. If in doubt, sacrifice the nut.
Merritt Island, FL
When a person asks you for advice, they don't want advice. They want corroboration.