As far as I know, eZFind (at least the latest 2.0 version) updates its index each time you publish/delete an object. So you don't have to run <i>updatesearchindexsolr.php</i> as a CRON...
The cronjobs have only recently been fixed in the SVN repo of eZ Find, and have been split into two - <i>ezfindexcontent.php</i> and <i>ezfoptimizeindex.php</i>. This allows the more server-intensive optimization to be actioned once or twice a day.
<i>settings/cronjob.ini.append.php</i> has also been added to ezfind - if you are using the stable 2.0 version you will need to create this yourself and add to the default cronjob script list or to the CronjobPart-frequent, e.g: