You shouldnt need so much video mem.
Theres very few games that need more than 4MB of memory...like SSB. Keep your video mem at 3 or 4 mb, and increase your dyna mem.
If you want to troubleshoot a freezing even though there is enough mem, drop the paging and up the dyna. Conkers, for example, will freeze after the intro scene (right before you start playing) if the dyna is not set at atleast 9MB or above in some cases (evox) even though there is enough free memory.