So I went and hit the new 915 3 wood today and loved it. I ended up hitting the 915Fd with D+ shaft excellent and really enjoyed the feedback the club gave as well as the low spin and slightly lower trajectory. However, the price tag is a bit steep and I am looking to add a 3 wood to the bag for Xmas. I really love the Titleist clubs as I play the AP2s and have a 910 driver. I am trying to see if the 913F.d is the same but older version of the 915Fd. It appears for the 913F.d the website says it is the larger club head but the 915Fd is the smaller? I am confused why Titleist would switch the lettering around from model to model. Please any insight on this would be helpful.