Here is the link to the custom options booklet with all the custom shafts for your review!

media.titleist.com/.../

Have fun!

The stock graphite shaft is close to what you are looking for. The target swing weight for the AP1 is D-1 with a 95 gram shaft- a shaft weighing 70 grams would decrease swing weight approximately 3 points with the 1/2 inch shaft increase adding 3 points- +/- 1 point dependent upon the weight distribution within the shaft. Thus, D-1 is probably achievable- I suspect to reach D-3 you would have to order with a lighter grip- perhaps around 42 grams. If you order and specify your desired swing weight Titleist will let you know if they can meet it.