Tape a ruler on the back of your forearm so that it extends out over the back of your hand. When you grip your bow and hold it up to shoot, you'll likely find that your hand is trying to turn the wrist out, but it hits the ruler. Turn your wrist back in and adjust your grip to compensate. That's how I was shown to get that wrist slap issue resolved. A little bend in the elbow instead of trying to lock it out helps too.
All else fails, buy a compound crossbow with lazer sights, nitescope, and heat seeking crossbow bolts.