Engineer,
You shouldn't have to delete the buffer files after changing the ini. By default, the client downloads 24 OGR workunits and 24 RC5 workunits. Once you change the ini, the client will just ignore the OGR buff-in and use the RC5 buff-in.
NakaNaka
You also need to restart the client after changing the ini file for the changes to take effect. right click on the cow icon and choose restart.