Not sure if you have chilled the fermenter, but a few days below 40F makes a huge difference for transferring clear beer.
And as other have said, don't put the siphon all the way to the bottom of the fermenter. I use an orange carboy hood and stuff the racking cane through the middle hole and start the siphon. Then push the racking cane until you just start picking up cruddy looking beer, then pull it up a touch for clear beer. If you are using a bucket, I am sure there is a similar solution with some sort of clip on the edge of the bucket.