OMP strut brace adjustment nuts

[lolsteve]

So having a crappy time with adjusting stuff recently
Now with the coilovers on the front I can't refit my strut brace as it needs to be shortened. However I can't get the nuts undone, tried penetrating fluid and using a hammer to shock them but no luck. All I'm doing is rounding them off

Any ideas? or is this a blowtorch kind of job