The configuration option that should affect the number of results exported for a table is this:
maxresultrows = 50000
Increase that value to the desired maximum number of events. It doesn't look as if this limit has changed between version 4.3.4 and 5.x, so maybe you had configured the value in /default and the upgrade overwrote the changes. Be sure to save your configuration changes in a /local folder. Don't forget to restart Splunk after making the change.
As a side note, if you export the events without "| table", you should receive a full list without the option set.