If the tail dips down upon launch, that would indicate that you are tail heavy or in need of some downthrust on the motor. The Slow Stick is not designed with downthrust--and don't try just bending the aluminum down as it will severely weaken the structure and likely break where you bent it. If you have access to a disk sander and want to make a downthrust modification, let me know and I'll let you know how you could easily corrrect this.

Other than that, it's hard to tell without seeing you fly what could be the problem. If the plane is trimmed right and launched right, it should fly straight out level and away from you.

Be gentle with your corrections. You don't need a lot of stick input to make the plane do what it needs to do. Give it a bit of stick and give the plane time to react.