1)
Why does he say "Kumah Hashem Kel Nesa Yadecha"?
1.
Radak: Since the Rasha says that You do not see, rise and lift Your hand over him!
2.
Malbim: He requests that Hashem rise in His mercy to save. Lift Your hand to show Your power!
2)
Why did he say "Al Tishkach Anavim"?
1.
Radak: This is like the Rasha said, that He forgot.
2.
Malbim: It is proper that You not forget the oppressed humble people with no one to comfort them.