> But are paging space just 24% why Memory bound ?

Because its looks for me that you have >>>>>file cache trashing <<<<!
which cause even some paging space in and outs.

Which means that either:
- The system has not enough ram at all for its load.
- The system and/or application is not properly configured for its
main task.

Since you provide no information about OS, Application and system
usage i can not give any tuning tips as already done.

regards
Hajo

BTW: get nmon to monitor your system and get familiar with the vmm of
AIX