My last three drivers have been Titleist. I just got the 910D2 and this time instead of putting a stock shaft into it, I went with one of the custom shafts and put the RIP 70 in it. The stock is the RIP 60. I thought the 60 felt light, and I prefer the heavier feel and lower launch of the 70. I'm planning on getting the 910 fairway, and was going to put the RIP 70 in it also, but I noticed that the stock shafts for the fairway woods are heavier then the stock driver shafts. For example the fairway stock is the Ahina 82, and the driver stock shaft is the Ahina 70. I was wondering what the rational for putting heavier shafts in the fairway woods is.