Then, two days ago, I saw that one bird feeder station (with two feeders plus suet hanging) was overrun with what I thought was a couple dozen small crows, but now I think they were grackles.
They were loud and squawky and knocked the feeders and the suet off their stands to the ground. One feeder was smashed, and the other had pecked-out areas where the openings were. Both feeders had bird poo ALLLLL over them. They demolished about 2 weeks' worth of birdseed in one feeding frenzy and left everything in a shambles.

I've read that you can use only safflower seeds because grackles don't like those... needless to say I'm a little hesitant to try again just yet, not wanting to attract that gang of marauders any time soon.
Any other ideas for how to feed the well-behaved birds but not attract bands of roving grackles?? Thanks in advance!