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@BrickMan
put the frame on its fork & wheels (and tyres or a carpet surface to avoid damaging rims).
Then if the BB tool you have isn't up to it, use the sheldon bodge tool (pictured in my post just above) and then stick a breaker bar on each end, you might need a mate to help with the other side (same force needed both sides).
I had a massive car (2ft+) torque wrench of good quality and got up to 350Nm (the highest the bar measures to) and it needed a bit more torque again than that to remove. Frame was a lightweight 531c steel job and its no worse for it. Though I would only apply the force in a smooth gentle pattern, don't yank at it.
Also get some plusgas liquid, best release oil I know of, if it doesn't help, nothing will. Best results 24-48hour soaking in the stuff.