1)
Why did he say "A'aneh Af Ani"?
1.
Malbim: I will answer my portion. Everyone has a share in the debate. You already spoke your portion - I will answer mine!
2)
Why did he add "Achaveh De'i Af Ani"?
1.
Malbim: My opinion is that Hashem planted De'i (truths) in the Nefesh. They are not known via investigation and comparisons.
