It is unthinkable, because of the essential and teleological unity of the Godhead, to suppose that Christ’s sacrificial work would conflict with the overall salvific intention of the Father in any way.
In other words, if it can be proven that the Father's intention is only to save the elect, then it would be purposeless for the Son to die for the elect PLUS others. Jesus came to do the Father's will; therefore He would not act in a way that the Father's will had not decreed.
The answer to this objection is quite simple. God has revealed his desire that everyone be saved.
David: Scripture also displays God as willing and desiring by will revealed that all men be saved. Within the Will of God there is will secret, and will revealed. The work of Christ exhibits both these dimensions within the Godhead.
God is not in conflict at all. See Scudder, Charnock, Daniel and Lane on this.