So you think I should try with the extended mag? I use the standard 9 round mag, considering that's what I carry with.
I have a Glock 26 and Glock 27, which is equivelent to your XD SC... I'll tell you this... I can't shoot those pistols worth a DAMN without the pinky extenders that allow my whole hand to hold on to the grip. It helps a lot.
I don't know how new you are to guns or your experience with shooting pistols... but every pistol is different. I can shoot some pistols very accuratly, and others, can't shoot worth a damn. I have pretty large hands so picking a pistol that fits my hand is crucial.
Always remember when shooting a pistol, and this is rule number 1 (besides the saftey rules of course), is DO NOT aticipate recoil! Pretend like you're not even shooting a pistol, don't tense up... relax but hold the pistol firmly, and let your FINGER do the work... Nothing else should flexed or moving other than your trigger finger, and it should be a smooth and solid movement. As soon as you feel the trigger engage, keep the constant pressure on the trigger until it is full depressed, make sure your motion is smooth and constant, no twitching or aticipation.
Once you do this correctly, you'll notice your shots are on target, and practice it over, and over, and over until you develope muscle memory.
Also, when looking at your sights, your focus should be at your front sight, not the rear, and not the target... but your FRONT sight ONLY. The target should appear blurry to you. The bullet is going to go where the front sight is, so keep your eye and main focus on the front sight (make sure its lined up with the rear sight of course).
Hope that helps.
report back when you try it out.