I had the 909D3 as well, but I had been hitting the 910D3 for quite some time when I switched to the 913D3. I only noticed a slight difference in feel and performance at first but after playing the 913 for a couple months I started to see some distance increases and accuracy.

There's a bit of difference in the specs from the 909 to 913 models, so I'd say to keep working with it for a while and see if it just takes some getting used to.  You may also want to consider re-checking your swing stats if possible.  The 913 driver is definitely lighter and has different launch characteristics than your old 909.  It may be that you need to match up a different shaft to the 913 to get the performance you're really expecting.  

In the past I used the 909 D3 9.5 with a Diamana Whiteboard 73 stiff shaft, just bomb that club. Recently went to Golfsmith to demo the 913D3 and was thinking of moving to the 10.5* head with the D+ 72 stiff. They didn't have the 10.5* head available for demo however they set me up with the 913 D3 9.5 with the D+ 72 stiff and I was very surprised at the launch numbers I was getting 14-16. I believe the 913 heads launch higher than the older 909 heads. You may need a lower loft on the new model, I am still reviewing my options however will probably go with the 913 D3 9.5 D+ 72 stiff combo and play to the lower setting.