Have had a look back here several times and as this is beginning to intrigue me, I'd like to investigate this a little further.. It has been some time since I worked on AIX, but I did...
Looking for leaks, find processes with high and growing total VM using 'ps -o vsz'. (This is on an hp-ux, but ps should work similarly on AIX.):$ (export UNIX95=true ; ps -exo...
The svmon did not show much, seems this sort is an > AIX 5.3 thing; try this one and check which has/have by far the highest value in the column "Pgsp":