I've just purchase a 910 D3 8.5 degree and also a 910F 15 Degree. Both have PX 8A4 and are tipped 1" each. The D3 came to me with a 5g weight installed and the F came with 12g weight installed.
The F feels superb - well balanced, I can feel the head brilliantly and I hit the ball very well with it - slight fade as is my normal shot. It's set to A2 to offset the fade.
Now for the D3 !!!! No matter what I set the settings to, the ball goes well right with one of the biggest slices I've ever had. I'm putting the ball in places I've never been. It's a fight to keep it in the park. The club feels totally different from the F and the shaft feels way to whippy for what is meant to be XStiff. I can't figure out how the D3 could be so different from the F. I tried putting the 12g weight in the D3 and it did help a fair bit, but the ball just keeps wanting to go right (just not as far right!).
Can anyone give me some clues as to what is going on here (apart from me getting a new swing :-o ) ? As I said, 910F with same shaft is brilliant, but the D3 feels like a totally different shaft. Looks like it's back to the SD until I get this sorted out :-)
Thanks
Ian