I'm not saying Jesus is mistaken about anything. I'm saying you're mistaken because you're taking John 10:30 out of context. Jesus himself showed what he meant by his being “one” with the Father. At John 17:21, 22, he prayed to God that his disciples “may all be one, just as you, Father, are in one with me and I am in one with you, that they also may be in one with us, . . . that they may be one just as we are one.” Jesus wasn't praying that all his disciples would become one single entity. Jesus obviously was praying that they would be united in thought and purpose, as he and God were. (1 Corinthians 1:10) This is what John 10:30 means, that Jesus and his Father are one in thought and purpose. So at John 17:11 you're not actually insisting that when Jesus is asking God in prayer to protect his apostles and disciples so that they be one as Jesus and God were one that Jesus is saying that he was wanting all his apostles to be one single entity are you. Because that's not what Jesus was praying to his Father, he wasn't wanting his Father to make his apostles to become one single entity.
Regarding John 10:30, John Calvin (who was a Trinitarian) said in the book Commentary on the Gospel According to John: “The ancients made a wrong use of this passage to prove that Christ is . . . of the same essence with the Father. For Christ does not argue about the unity of substance, but about the agreement which he has with the Father.”
Right in the context of the verses after John 10:30, Jesus forcefully argued that his words were not a claim to be God. He asked the Jews who wrongly drew that conclusion and wanted to stone him: “Why do you charge me with blasphemy because I, consecrated and sent into the world by the Father, said, ‘I am God’s son’?” (John 10:31-36) Jesus didn't claim that he was God, but that he was the Son of God.