First of all, there is no text in which literally Jesus says what you claim. These words are not His words. They are your words, and they are not present in the Holy Writings or in any faithful precise translation. You have given us your rendering of what you think He said, which is clearly an uninspired fallible rendering. You say you are not explaining away what Jesus said, but that is exactly what you are doing when you try to take away from His repertoire the ability to speak truths figuratively, and forbid Him to express Himself as the spiritual Lamb of God. Shame on you.
You have a misinformed interpreter. As He instituted the prototype model of the Remembrance Supper, Jesus demonstrated again to them, as in John 6:35, the use of figurative language.
He with the twelve disciples were eating the Passover, which is (1) a memorial feast in remembrance of the Hebrews' slaying of their unflawed lambs, (2) a recollection of the act of Hebrews painting their lambs' blood on their doorways, (3) of hastily dining on roasted lamb meat and unleavened bread, (4( a calling to mind of their freedom from slavery and haste in leaving Egypt behind, as well as (5) keeping in mind God's commandment to do it and (6) to observe it with the yearly Passover ceremony.
But Jesus and His disciples were not themselves leaving Egypt. In this supper they were only rehearsing figuratively what their forefathers actually did literally.
In this figurative context, where they did inherently as well as explicitly understand the context, Jesus, handing them fragments of bread, said (according to Matthew who was there, and Mark informed by Peter), "This of me it is the body." He said "Take, eat." He said (according to Luke and Paul), "In remembrance of me, do this" (the "this" being eating a piece of bread). Then the same was repeated regarding the fruit of the vine, the wine. Jesus was laying out for them the form of a memorial ceremony for them, to be later handed down to their future disciples
Literally, from Jesus' pre-Cross hand, bread was bread and grape juice was grape juice, nothing but and nothing else. But within the context of recollecting how the disciples ate the last Passover with Him, taking these tokens ceremonially then to remind them in later times of the occasion on which the tokens were given. The observance was also to bring into recollection what happened to His own Body and Blood, until the promise of His return would be carried out.
That is all, and that is enough. But the Eucharist has both literal and figurative literal language, from which we are, as the spiritual descendants of the disciples, to infer a literal meaning: "In bringing to mind Myself and My Passion, perform this ceremonial partaking of literal bread and literal grape juice, in a communal gathering."
No artifice of transubstantiation was intended or desired, and no transmission of spirituality by a literal consumption takes place. In the true Remembrance Memorial, bread is still bread, and grape juice is still grape juice, and a pretense of any change of these materials is absolutely unnecessary to transmit the knowledge of His once-for-all-and-for-all-time sacrifice, reminded by the tokens of His love for us.
Have you EVER read John 6???????