Im a newb to 10mm and have a few questions . Im going to be shooting some underwood ammo . . I will contact Glock to see about updating the gun on monday . Should I change the recoil spring to a wolf? which rating?Good ideato change to a 3.5lb connector? anything else I should change ? . I need to research ammo but can someone give a quick rundown of when and why to use 165gr vs 180 vs 200 ?