Swing Weight Changes Question
So I recently picked up a used set of Mizuno MP18/SC combo's. They have the C-Taper 130 X's in them and are currently at a D3 SW. When I took them to the shop to have them lengthened, they said it would jack the SW up to a D9, which would be way too heavy. Is there a way to extend the irons without jacking up the SW? I probably shouldn't be above a D4? Although I haven't done any "optimization" and don't really know that much about fitting. The guy at the shop is basically telling me there's not a way to extend them without really jacking it up.