Be very careful about "agreeing to overtime" in your EBA, as this will make it harder to take action NEXT time you feel you are getting screwed on your EBA.
IE: It may work this time, and force management's hand, and you'll get your 10% (or whatever), but in 3 years when your EBA is up for re-negotiation, and they stick you AGAIN... what recourse do you have ? You cannot do an overtime ban, 'cos you all agreed this time that you WOULD work a reasonable amount! hence it WOULD be illegal, and you would NOT be honouring your end of the agreement.
Hope all ends well... and safely