1)
Why does it say "Al Chalomoseichem"?
1.
Radak citing Targum Yonasan: [Do not heed] those who dream your dreams 1 .
1
I.e. and say that they are prophecies. (PF)
2)
What is the grammatical form of "Kashafeichem"?
1.
Radak: It is a To'ar (kind of person). Kashaf (a witch) has the same form as Ganav.