“For example no one can deny God revealed much through David, yet he could hardly be said to be “completely consistent with God’s character, nature, person, work, as well as completely in line with every jot and tittle of His previously revealed word.”
True. And it during the times when David’s character is inconsistent with the character and nature of God, that he is to be ignored, rejected (sorry about that, David). But, how would one know when those times occur? Would it not be by checking David’s character and nature against that of God’s? And, how would this be accomplished? Would it not be by seeking to know, understand, confirm the nature and character of God? And how would one do that?
Like I said, you have my sympathies, because I understand your position, even if you don't. You're making assertions and posing questions that can't be answered in support of your "character of God" thesis, but forgetting it is the thesis itself that needs to be proven, not speculative consequences IF the thesis were true.
In short, you are assuming what you need to prove, so your reasoning is invalid.