1)
What is "Nikmasam"?
1.
Ibn Ezra: It is their exposed [vengeance, as opposed to their thoughts, which are hidden].
2.
Palgei Mayim: When I fall in their hands, they plan to take vengeance on me, and it is very evil.
2)
Why does it say "Kol Machshevosam Li"?
1.
Rav Sadya Gaon: All their thoughts are Alai (about me).