@sellwithsavel Unfortunately, there isn't a way to remove a station's from Thumbprint Radio without deleting it from your collection entirely.
If you'd like to see something like this added to the service, I recommend creating a Feature Request for your suggestion here.
In the meantime, I recommend to continue to thumb down any tracks you don't actually want to hear on your Thumbprint Radio station as @TannerPandora suggested.
Hope this helps!
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