Hmm, are you by any chance referring to the "terminator handling" options under Developmental / Experimental menu?
What I typically do in these situations myself is I delete (dissolve) most of the CAD edges that traverse the flat surfaces of the mesh. Then I add in random plane cuts near any curved surfaces - really sloppily, just so the topology changes a bit and there are a few more support loops in there. That typically helps, at least on my end.
You can also try playing with deleting the normal tag and playing with the phong angle. Retopology generators tend to work fine as well although it depends on the type of CAD mesh you're dealing with.
On thing that is still on my personal to-do list is to see how the new phong tag weighting options affect things in Cinema 4D 2024. That seems to me like it would be the easiest solution :)
