I’ll take a crack at it…
When doing a prop balance what we are actually doing is balancing the “rotating assembly”. Prop, spinner, spinner bulkheads and even the crankshaft to a lesser degree. So yes, include the spinner. If you have the proper equipment but haven’t done this before, try to get someone with experience to help out. Prop balancing is IMO a combination of science and art, some peeps are really good at it and some just make things worse. Cheers