Hi Paul, 

The 915 has less spin so it may be a little lower because of less "float" in the air from spin.  Also, are you using the same shaft in both? You may want to check your swing weight in both and see if they're the same and if the shafts aren't the same, put your 913 shaft in the 915 and see what happens.  Just some thoughts, good luck!

Dan

I'm pretty sure I have the same shaft both diamana blue although one is 62g. I notice when I put my 913 shaft in the 915 head it still flies lower so I set it at a4 to bring up the ball flight. I'll give your suggestions a try!! Thank you

I may be wrong, but these are too different heads. A shaft that works for you in one, may not work in the other because of the spin properties of that head. Only way to tell is by getting properly fit for the new club.

With regards to launch with the 915, I feel like I need to set up right shoulder low to hit up on the ball. If I set up more shoulder level I'm hitting lower shots that don't go as far. Tee it high and catch it on the upswing and it just GOES.

I was hitting the Diamana Blue 60 in my old png Rapture. By coincidence, or maybe not, fitting put me with the Diamana Blue 60 with the new 915D3, too. I had trouble hitting draws with the png, but am able to draw with the new 915. Last night I hit a bomb with about a 15 yard draw on a dogleg left hole. I couldn't hit that shot before. My buddy commented that this club could change the way I approach the golf course. But it's taking a little adjustment. Maybe that's all you need, too?

I'm messing with the adjustment settings, when I hit it high it does travel for days just having trouble doing that, mostly I hit low bullets