Removing a lockring, especially one that was over-torqued, requires a bit of technique.

Lock ring tools with a guide pin keep things in alignment better. I use a chain whip that has a hole at the end of the handle. When necessary, I will thread a rope through it and wrap it around the tire a few times and tie it off. This is like a third hand to hold the chain whip in place.

Then using an 18” breaker bar and my left hand to keep the lock ring tool engaged and straight, it makes short work of it.

John