I use the large suet cages too. Have 4 of them about the coop and run.
But I have a question on the cabbage. Do they eat it well? I've never tried cabbage but mainly because I didn't think they would eat it.
I gave mine some cabbage yesterday and it wasn't their favorite, but they ate it. They'd pick it up, throw it down, walk away and come back. Except the one in a hard molt, she just ate it. Mine would rather tomatoes, grapes, corn on the cob, bananas, yogurt, cottage cheese, and melons. Oh, also my fern if they get too close to the chicken yard. The chicken yard had a lot of ferns that were decimated within a day of establishing the chicken yard there.