How are you controlling Polarity, with the Monterey?
You are on AMC 11 @ 131 west, only a few Free Channels there. See "The List" at the top of this web page, or lyngsat.com/america.html
C and Ku are Frequencies. C Band is 4 digits, Ku is 5.
Polarity is Horizontal and Vertical.
I never used a Monterey receiver, but on other receivers I used, I would change from an even numbered channel to an odd numbered channel to switch polarities.
Are you getting CSPAN, which is listed as Vertical, on channel 7? If so, then channel 8 would be Even.
I don't know why you are not getting The Weather Channel good.
I might be mis-reading your posts, but The Weather Channel is still scrambled with Videocipher isn't it? C-Span is in the clear, but Weather as far as I know is scrambled. If there is no Videocipher in the Monterey receiver (or the decoder has failed or is failing), it'll show up scrambled or possibly with bad video.