Projectiles start too far forward when their velocity is high enough
If you have a projectile skill (best test on an artifacts item) Set the velocity to 30 and sfo to 0, the projectile still starts infront of you by 1 block meaning you can stand infront of a wall and shoot through it. I've had to set all sfo to -1 for fast projectiles but then the item is harder to aim downwards and upwards properly because it's start 1 block behind you which i need to do or people will no-clip through walls.