quick question for those get nodes, Are you using get copy or get ref?
Im not even going to pretend I understand what I just copied. But its not spawning meshes and Im not sure what I missed.
is the samples var set to zero?
Update: I figured out I need to set an amount of samples 
Question about how to improve accuracy, Like you mentioned as Its pulling a part and overlapping a bit while dragging the spline points. Cant seem to make it really hold to the fence post point.