When you statically balance you make like parts the same weight, in the case of the rods you make them the same weight in the same places (big ends and small ends), and this can work well when the weight differences (right vs. left) are small. When the differences are larger you need to add in dynamic balancing to make up the differences (different bob weights). A proper balance service will use a complimentary mix of static and dynamic to get the job done right.
Dynamic balancing of the crank alone, can be complimentary, but it is difficult and potentially unsafe to remove weight from a Norton's rods/pistons, so if your reciprocating weights are spot equal you may be good to go. Spinning the crank with proper bob weights is the best way to check your work and gives you a visual picture of what the secondary's are doing when done with a strobe light.
The service I have used for years marks and installs the engine sprocket, the rotor and the pinion gear are keyed, but installed. These and bob weights according to the balance factor chosen then spun and strobed. No guess work, no judgment, go worry about something else