How do I increase the importance of tags in search results?

Question

I've been trying to increase the importance in tags in search results. So far I've tried to change the 2 to 3 on line 749 of the qa-db-selects file, but it doesn't seem to make any difference.

Any ideas?

 "(SELECT postid AS questionid, 2*LOG(#/tagwordcount) AS score, 'Q' AS matchposttype, postid AS matchpostid FROM ^tagwords JOIN ^words ON ^tagwords.wordid=^words.wordid WHERE word IN ($) AND tagwordcount<#)";