We’ll have to agree to disagree then. I prefer shorter lofts on all brushes even Boar. The shorter the better. The stiffer the better. I don’t like soft and floppy brushes.I like shorter lofts for badger, to me, that is a lot of diameter for that short of knot in synth. I'm a proponent of the 1:2 ratio that Simpson tends to follow. Things tend to be different though in synth. To me it seems like you need 1:2.5 otherwise you end up with a stiff brush.
The other problem with synths in general is they give you a 55 mm loft because the damnable glue bump robs you of 8mm. Not sure why they don't just use a longer fiber and recess the knot further in the handle.