I have a site using the Apache Solr Search Integration module with a short-form content type that is getting weighted too highly in the Solr index. I've tried adding "Bias" to the other content types and leaving the short-form content type set to Ignore, but even with other bias settings maximized the short pieces still rise to the top. Looking at the particular items that appear at the top, it seems to be that multiple instances of the search terms in a short piece cause it to rank higher.
According to the help on the bias settings page, "Any value except Ignore will increase the score of the given type in search results." Is that a limitation of the Solr module or of Solr itself? Ideally, I'd like to decrease the relevance of the short type. What are my options for doing that?