1. Place baffles on all your feeders.
2. Place feeders far trees or anywhere else squirrels can jump from.
3. Use cage feeders that have the special grove for a perch.
4. Use safflower seed.
5. Provide a squirrel feeding station far from the feeders.
That is my idea, but you don't have to limit it to these five ideas. You can use even more if necessary.
Birdman