Hoping I can get some help from the logic puzzle experts out there!

I have completed most of book 1 so far; however, there are three I am completely stumped by: #138, #155 and #198.

I will start with posting my progress on #155 (Radio Winners, book 1) as shown in the attached image. Have spent many hours on this and been through all the Logic Puzzle solving steps on this site but cannot seem to get any further. Either I am missing something obvious or there are more advanced techniques I am unaware of: really hoping someone can help me out here.

I have completed most of book 1 so far; however, there are three I am completely stumped by: #138, #155 and #198.

I will start with posting my progress on #155 (Radio Winners, book 1) as shown in the attached image. Have spent many hours on this and been through all the Logic Puzzle solving steps on this site but cannot seem to get any further. Either I am missing something obvious or there are more advanced techniques I am unaware of: really hoping someone can help me out here.

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