I took a chance and cut off a Goldfinger pup that was not growing; apparently I did the right thing.
As for the Dwarf Namwah that sent out a 2nd pup--she's doing fine but I think I might have saved both if I'd gathered my courage and whacked off the larger one earlier.
One of these days I'll get brave enough to cut a pup or 2 from the Dwarf Cavendish.