I’m sorry this is happening. White millet is what I use too. Some people swear by white bread. And that doesn’t seem to attract the natives. You could try that. Crumble it up. Raising the platform off the ground might help with the white crowned. It seems odd that you caught a downy. I only caught birds like that when I put in Suet to catch Starlings. Let me know how it goes. The goldfinch like bird could have been a pine warbler? or maybe a female oriole? or pine siskin?
Its on a platform over foot off the ground, though the grass around it needs to be cut (its been to wet to mow). The downy and the Orioles are whats really getting me. I did show my husband the female orioles and he says they’re bigger than what he removed from the trap. I’m leaning towards one of the yellow warblers, we have a couple of them here. I don’t have suet out at all. At least you’ve confirmed that I’ve not forgotten something major. I was standing by the window when the two female Orioles hopped into it. They literally flew down, landed on it, and then one after the other went in! WTH?! Oh well.