Lots of great tonearms to buy, the 4pt is certainly one of them. You did not specify which Soundsmith cart. This will limit how specific recomends can be as the arm-cart relationship is far more important that the table-arm relation is.
Yes, with poorly engineered arms this is true.
This right here is why I would go with the Conqueror. Mark Baker designs his Origin Live arms properly, so you simply never do have to waste one minute worrying about compliance. I couldn’t begin to tell you compliance for anything I have put on my Origin Live arms. It simply is not a factor.
The Conqueror also uses integral hard wired phono leads. Huge advantage in both cost and performance over designs that require you buy a phono interconnect.