9.5 gr. will soften up most shafts, esp. if it is R flex.
(getting older)I've experimented with as much as 7 gr. and even that amount softened the shafts I was trying; I wanted to keep playing the same shaft, like you. Another thing I tried was getting the same shaft in the next stiffer flex, and adding the weight. It also worked OK, but depends on the shaft specs. For me, a stiffer tip shaft would feel too loose when doing this(in the R flex), so it is an experiment waiting to happen for you. I found I could play longer than normal length drivers/fw clubs, so less weight is now needed, but I always try to weight the heads around 202-204 gr..
In your case, I might suggest getting the same shaft, you are now using, and tipping it an inch or so. Or trying the next flex up. Not sure if this helps for an answer.
Let us know what the particular shaft, & flex, is you are wanting to use, if you don't mind saying.