I think the variable that has about 80% of the impact to the feel of the majority of these newer synthetic knots is loft vs knot size ratio. The lower the number, the springier these get. I have plisson style, plisson fan, tuxedo, tuxedo fan, cashmere, the synbad, and one of the 'premium' knots. Sizes vary from 22 to 28mm, and I set most of them myself at the highest possible lofts, because I've found that's how I like them. The knot type, fan vs bulb, and the glue bump size are factors as well, but to a much lesser extent. It's the loft / knot ratio that makes or breaks these newer synthetics for me.