D2

From D4, D3 will maximize draw by a more upright lie, increasing loft and lie to D2 will maximize closing the face (increasing loft). While this may help, you may need to get your swing analyzed to help correct your slice. The club can be maximized to your swing but can only do so much for an out to in swing slice.

I would go to a quality PGA certified instructor and get a lesson. If you're slicing the ball, there is a flaw in your swing. Don't try to fix your swing flaw with equipment.

Hi, If you are happy with the launch angle and just want to help with your slice, try D3. If you would like to hit it higher, move up to A2 or D2.

Hope that helps!

Hello! I am a righty but used to have a bad slice problem as well. My buddy that got me into golf is a scratch player and he suggested I roll my grip over so that I can see the top two knuckles of my left hand (would be your right hand). This keeps the club face closed on impact and produces a very low strong draw. I went from never hitting a fairway and having to pack 12 balls just to finish 18 holes to a 12 handicap in 5 years of moderate playing. Best of luck hitting it straight and happy golfing!

I'm a lefty too. Have a big problem with the slice also. I have mine set to D2 and with a little bit of a strong grip my drives are a lot straighter.
Hope this helps