If someone follows his “predispositions” based on his region of origin instead of the “facts”, he certainly is not being objective or even honest. This is what you are saying the Steipler Gaon did.
On what do you base your assumption that Avraham Avinu and Adam HaRishon spoke havara Sefaradit. You may be older then I am, but I don’t think you’re ancient enough to have personal knowledge.