I am very old school when it comes to quilting and sewing which probably stems from learning to sew garments long before I ever attempted my first quilt. I would not attempt ANY curved seams without pins and lots of them. Winding ways is on my bucket list. At a minimum I would use 3 pins for every seam, probably more. The first pin to match the center point of the curve on each piece and one for each end. More than likely I would insert two more pins at the half way point between center and edge.
Some people have the curve master foot for their machine and I have seen it demo'ed at many shows and they don't use any pins. In order to use this foot on my Bernina I would have to buy a special adapter to fit my shank which drove the price of the product up quite a lot and quite honestly I don't mind pinning and I get good results with pinning.
If I were you, I would try a few units with pins and see if your results aren't more to your satisfaction.