Thank you, Wesley, thatās the Protestant understanding of Scripture as well.
I hope it is, because unfortunately I do not see the evidence of that in the way you are interpreting scripture.
This is a very difficult passage of scripture to understand in light of other, clearer, stronger statements in Scripture concerning the assurance of the believer.
You cannot simply dismiss as āvery difficultā or āunclearly statedā whatever you cannot harmonize with your theology!

I suggest you reevaluate and change your theology to make all of the scripture verses make sense. After all, isnāt that in the spirit of Sola Scriptura? Your theology is your ātraditionā, but since you believe in scripture above tradition, you can always change your tradition. So I suggest you change that tradition.
What is so difficult about āEvery branch
of mine that bears no fruit, he takes awayā (John 15:2) ? What is so unclear about it?

Show me how you harmonize that with your theology, if indeed you interpret scripture as a whole and not in isolation.
John 10:27ff, however, is not hard to understand, but is clear in the strength of the promise made by Jesus.
What does it say -
āMy sheep hear my voice, and I know them, and they follow me; and I give them eternal life, and they shall never perish, and no one shall snatch them out of my hand.ā (John 10:27-28)
We discussed eternal life before. Itās the same as the vine and the branch analogy. What about the part that says āno one shall snatch them out of my handā? To snatch means to take away by force. Sure. No one can forcefully take us away from Jesus.
But the verse says nothing about a person, by his own will, wanting to go away from Jesus. Nobody snatched him. He went away by his own will. Do you think Jesus will keep him against his own will? No. See John 6:66. Many of Jesusā **disciples ** (his sheep) drew back from him and no longer walked with him. Did Jesus keep them from going away? No! He let them go. Nobody snatched them from Jesusā hand. They went away by their own free choice.
Some other somewhat difficult passages to grasp with respect to Jesusā and the Fatherās promises are in Heb 6, and 10, off the top of my head.
Yes, but I perceive that the reason why they are off the top of your head because you have been taught a wrong theology (tradition). In Catholic theology, these passages are not difficult at all! They all make sense. I invite you to consider Catholic theology more seriously if you want all of scripture to make sense.
Are there any other passages you think demonstrate Jesusā inability to save His sheep?
No. Jesus is perfectly able to save his sheep. But the nature of Jesus is such that he doesnāt do it against someoneās will. Jesus intends to save everyone (see 1 Tim 2:4), but the reason I got saved is because it was my will to be saved, and so I accepted Jesus. See what Jesus said in Matthew 23:37 -
āO Jerusalem, Jerusalem, you who kill the prophets and stone those sent to you, how often I have longed to gather your children together, as a hen gathers her chicks under her wings, but** you were not willing**ā