Humor an old man charlie. You're going to throw that bin away anyway so try this: Stop up that sink strainer you have in the center and cut a big hole in the side of the tub that would let the level get to about 4 inches until it spills out into your vessel below. You will obviously have to change the arrangement you have there. I think that will cut down your splash.
Another note, make your vacuum side hose as large as you can and as short as you can. Almost like a flexible coupling. On a warm day the hose might collapse and shut down the flow.
What is that stainless tank? That is a nice tank.