U can also dual wield the brands
But i see,having 8 attacks vs 4 attacks there is quite a difference indeed.
You surely got already quite some niche uses for SoS therefore.
So its certainly not a must to change it.
Maybe 1 more damage and/or 1 more defense(thematically) for the price?
Dual wielding omits shield ...having just read through the combat mechanics again,those shield hits seem to be pretty strong and nice to have,though.And shields add defense,too.
Btw,did i understand it right,that flails/morningstars not only add 2 att vs shield,but also ignore them completely when damage is dealt,thus no shield hits possible?