I am not sure if you are complaining about your sterring response SURFACED or submerged. If surfaced, then yes all nukes are dogs on the surface, but expect the turning response to improve markedly when submerged. The upper rudder makes a huge difference, all improvement. Being a prop driven boat you will also find a better response in one direction over the other due to the prop torque. if you build a pump-jet propelled boat you will find the surface response to be even worse that you are currently experiencing, while again, it will markedly improve when submerged.
Bow thrusters, as Skip Asay for years has explained, do almost nothing to improve turning, especially when underway. Don't waste your time.
I have found that by moving the center of mass, not gravity, forward, the boat will pivot around that center of mass and this will help your steering significantly. It can be difficult to due this if you are unable to compensate with foam for the mass forward.
Last word...now you know why boats always have tugs in attendance assisting at low speeds.
Hope some of this helps.
Jonathan