Not involving the committee is tying your own hands behind your back.
The committee has a duty to enforce the by-laws of the building as regards noise and residents’ behaviour, as well as maintaining common property. The floor is common property.
My advice would be to pursue a section 232 (2) complaint against the committee for having done nothing to remedy your issue. That will force them to take the action they should have taken years ago.
But first, you could talk to a strata lawyer or, perhaps, StrataAnswers about what your options are at the Tribunal, epsecially if you’d rather take a case directly against the upstairs owners.
And that is fair enough. People who are happy to destroy your peace and quiet to suit their lifestyle deserve no consideration or sympathy. You’ve been way too accommodating. Time to go Braveheart on their asses.