Thank you for the tips about bump strength.
After playing around with it, I guess it isn't the level of shine I'm having the issue with, but more with how it is being applied.

The blue highlighted areas have such intense shine from the rest of the hair. I don't suppose I can somehow increase the bump for just these parts.

Then the highlighted green section changes so abruptly between dull & shiny like this. Anything I can do short of changing the lighting? I don't really want to change the lights as I'm happy with how everything else is looking besides the hair, and moving/changing the lights would change all of that too.

Poser scripts by Snarlygribbly