For the sake of clarity, understanding an extreme Catholic view-how do you reconcile your view of  sacrifice and the role of the priest and the book of Hebrews in the NT? I do not intend to prove you wrong. I want to understand what you believe. 
      I have heard the Eucharist referred to by Pope Francis as a memorial and spiritual food. The Vaatican II documents refer to Jesus' sacrifice of his body and blood at Calvary and the Mass a memorial of this. No conflict with NT apostolic teaching. 
      IF you mean the priest is offering sacrifice on behalf of the People of God to God the Father I think Hebrews says something  different. If Jesus is being sacrificed again in an "unbloody" manner I take issue with this as an emphasis in need of reform. 
       As Cardinal Newman said, when asked what he would do if the Pope declared it a sin to drink wine: "I would drink first to conscience and then to the Pope".