Hello
The only thing which you can do is increase the buffer parameters and increase the hit ratio.
Even if the hit ratio is above 99% still there will be Swaps observed in ST02 and those swaps are cumulative.
Check this link to know more about repository buffer buffer definitions:
http://help.sap.com/saphelp_nw2004s/helpdata/en/c4/3a6def505211d189550000e829fbbd/content.htm
You may review the SAP notes I have mentioned above to do some justice to those buffers.
Regards
RB