Why does it say "Ekra lEi'lokim Elyon"?
Radak: Even though the king chases me, I call to Elokim, who is supreme over everything, and He will save me from him.
Malbim: I call to Elokim because He is Elyon, i.e. the First of all causes.
What do we learn from "la'Kel Gomer Alai"?
Yerushalmi (Kesuvos 1:2): If a girl (born in Adar) was three years and one day, and Beis Din made a leap year (so now it is Adar Rishon, and she is less than three), her Besulim return (grow again). If not, they do not return.
Radak: He completes His Chesed on me. Many times He did Chesed with me; now He will complete the Chesed on me regarding the kingship.
Malbim: He is [the First, and also] the last of all causes.