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Slippage is not my issue. I'm pulling up from the back, towards the front, so the right way. I've tried nipping it tighter too, just to induce movement.
I really think force is not the issue (I know more force should work) but the frame is flexing, my breaker bar / nut interface is flexing, soon something gonna snap.
I think I need it to move under my current force, hence asking about penetrating oil and other things that could loosen it.
To answer my question, do you all think penetrating oil won't help?
So:
It sounds like you need a second person to hold the bike while you increase your leverage.