Plastic reels are perfect for 35mm, not so much for 120. I greatly prefer the stainless steel reels for 120, and even then you need to be careful about where the film bends at the start, or you can easily leave a crescent mark on a good neg.

That being said, when using plastic, photo flo is great for drying, so after removing your negs from the PhotoFlo, don't rinse the reels, just shake them off really well and set them out to dry. If you need them again right away, use the hair dryer. Even the tiniest bit of water will cause mad stickage.