1)
Why does it discuss their table?
1.
Radak: This corresponds to b'Varusi.
2.
Malbim: To trap a bird, one puts food in the trap. It comes to eat, and it is trapped. Therefore it says that their table that they come to eat on it, will be a trap for them.
2)
What is "veli'Shlomim"?
1.
Rashi: When they hope for Shalom, reverse their Shalom to a pitfall.
2.
Malbim: What they think will be Shalom for them, should be a Mokesh in front of them (something that will harm them).
3)
Why does it switch from "Pach" to "Mokesh"?
1.
Malbim: The Pach traps the bird, but does not harm it. The Mokesh harms it.