Rocmon, nice job. I need to get over to KP and do some research, as I've been wanting to modify my Savio since day 1.
So you completely removed the UV sleeves, or just stuffed them with brushes? Mine are empty right now.
I've been thinking about doing what cfarm mentioned and filling the weir voids with foam. Don't like that void, and find frogs hiding in there all the time.
I've added several BK brushes, and modified the pad slightly, but more needs to be done. Should have added a drain when installing, but did not and now I pay at cleaning time.