Sauve is what I currently use as well. Thanks for the website! Here are some of my personal tips:
1) Gently wash curly hair. Do not apply shampoo directly to the ends of your hair (hair is driest at the ends, making it fragile. Slipt end result in frizz!). Try to keep hair washing to once a week. If you need to cleanse your hair inbetween rinse your hair with water, and condition.
2) Never towel dry curly hair, it causes static, and frizz! Instead, squeeze out the excess water, and let your hair dry naturally.
3) I find my hair is smoother if I apply a little leave-in conditioner while my hair is drying.
4) A lot of anti-frizz serums (including John Fredia) suggest blow drying your hair smooth. Unless you have a professional quailty hair dryer with a diffuser, AVOID those products. Using a regular blow dryer with your anti-frizz serum, will actually make your hair much worse (I know from personal experince)!
5) My hair (and I believe most peoples) often horribly frizzy in the morning, after I have spent hours laying on it. To reduce pillow friction loosely braid your hair and/or put it in a bun.
Sorry I can't help, since I have never tried Redken's products. I can't see why you cannot mix products, I often mix conditioners. You could go to the manufactures website and write to them to be completely sure.