I brought it to the gunsmith today, who has the front sight adjust tool. He said he has seen a couple of SD9 with misaligned front sight and it took 2 mins for him to fix it. Then I tested fire at his range, and now it hit in the lower middle of the target. I believe you guys are right, 6 o'clock hold is not ideal for this model and I will try center cover or dead cover later.
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