Think About It,
Welcome to the Brotherhood!
First, the sights: The Glock factory sight picture is the fastest to acquire that I've found; nothing is simpler than putting the ball in the box. If you need more light around the front sight then carefully open up the rear notch with a needle file and an Xacto knife.
Second, the POI: For years I wouldn't buy a Glock because the grip angle made it point high. One day a friend noticed I was gripping with a fist. He told me to press on the front and rear straps as if my hand were a C clamp and point at the target with my thumb. Darned if it didn't work! This also positions my shooting thumb over the base of my support thumb. I was spending all my time distracted with how the gun didn't fit my hand when with a very slight adjustment I could make my hand fit the gun. Try pointing at things with your shooting thumb for awhile and see if that doesn't help. Good Luck!