Chan Eil Whiskers
Fumbling about.
Yup. Soft and luxurious silvertip badger equates to no backbone and face lathering with the glue bump. Just how it is. That's why Simpson make their Best and Super knots dense and buried deep. But they still are ideally brushes for painting, not swirling. The thicker bristles of the two band lend themselves better to the role of a scrubbing brush instead of a painting brush.
I too like two bands. I also like Manchurians (which are maybe two band Manchurians whatever that means).
These are 30mm or larger MS silvertips. Huge walls of badger. I use both to face lather and find them to be soft as clouds but with loads of backbone.
I don't own any Zenith silvertips (only boars and Manchurians), but I've read the Zenith silvertips have even more backbone than my copper handled Zenith Manchurian which has he backbone of a transplant.
I don't know that I believe any brush has more backbone than that copper Manchurian, but it's hard to discount an honest opinion from someone who has the brush (especially when I don't).
I'm no expert on anything brush related, but perhaps there's more to it than just the hairs. Density. Depth of the setting. Things I know nothing about. Etc.
Happy shaves,
Jim