Daniel, I don't know if it is available in your area, but I buy a fat free coleslaw dressing in the refrigerator secion of my grocery store that is great. It is called Jimmy's fat free cole slaw dressing and it is only 1 point for 2 Tablespoons. Otherwise, looking at the ingredient list, it looks like it has onion, celery seed, mustard seed and tumeric. I obviously don't have the amounts, but maybe these can be a place to experiment with yours?
"Make the most of yourself, for that is all there is of you" - Emerson