I had the 909D3. It was decent, but like you I wasn't getting the distance out of it. So I sold it last year.
This year, just a couple of months ago, I got the 910D3. I have the Diamana 'illama shaft.
I have the 9.5* and I adjusted the settings to a 10.25* and +0.75 fade.
My driver swing I have a lower ball flight. So that's why I have those settings. Now it's a nice boreing low to mid flight trajectory with some roll.
I really like the shaft too, it has a nice kickpoint.
My driver swing speed is 109.
Now I'm hitting it farther than my 909D3. I would say maybe 20yds longer.
It's a great driver, however, it's definatley louder than the 909 series. That's my only pet peave about the 910 series.