Search result priority is largely irrelevant for rare or specific files, since there are going to be few results (at least, few clearly different torrents) and each result is going to be inspected by looking at the file list.

Indexing file names is the search quality improvement you need most. For example, I tried searching for "Pretty Polly", by the Poison Girls; moderately popular niche music. There are 0 results for "pretty polly" and 2 results for "poison girls", one of which is a complete discography collection containing that song. Imagine the results for more popular and prolific authors.