I don't think it's close enough to try reshafting. Plus that can be a rat-hole. I used to have a favorite shaft but lately I can't tell what works and why. Shafts are so expensive now that I hate to go too far down that road.
I bought a $9 tip for the Srixon on ebay. I'll try a shaft in it instead. One try. If that one doesn't work, then both drivers have to go. It's really interesting that I cannot beat out a 2009 driver. It does have some poon in it, though.
What I haven't mentioned to this point is the lofts. I am a LOW hitter and need lots of driver loft. The 919 is 12 degrees, and launches way too low. All of the 10.5 heads with adjustment to 12 are no good for me. I need a native 12-13 degree head and it has to be a high launch design besides. So there are not that many of them in the OEM world. Mostly Cally and Ping. I suspect I should try a Ping G. BTW anyone have a K15 12 degree they don't need?