Custom Variables can't view detail (no replies)

I'm using Piwik 2.1.0. and I have 3 Custom Variables. One of Variable is userId, my site has about 15000 users. Every day, the site be visited 3000 users.

I set a config/config.ini.php
[General]
datatable_archiving_maximum_rows_subtable_referers = 5000


I got the export file to XML from Custom Variables, but the data was 1000 rows + "Others". I want to get all detail data from Custom Variables.

How can I get the detail data?