brownmoose13 That driver was originally made/sold at only 263g. Super lightweight head....women's club by design.
Using 1 of those funky SW 'calculators' and plugging in a variety of numbers for the components, I cannot come up with the SW you are getting. You need to check again, imo. You should already be below that B5(the BB driver), and I have no clue as to why it's at C5 now.
Without knowing all the components actual weights, I can't figure it. Someone, somewhere, along the way may have made some changes to the head weight(inside).
Pull the damn head!! 🤣