I internally balance all my engines. With two seperate builds and Eagle cast cranks:
1 - stock rods, forged pistons - needed Mallory.
1 - SIR Eagle rods, forged pistons, needed only drilling (and a lot of it).
If you have a vibration, it is well worth taking it apart and having a shop properly address it. You might get it better but not right, and that crank is not known for taking a lot of abuse well.
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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