Ok this is difficult because I dont have you personally,so I cant physically move you where I want you
But here goes,and ask questions if something confuses you.
Even in a straight line stance, your feet should be canted at roughly a 15 degree angle towards your power side,thats why I dont like it being called a "straight line" stance, because its a confusing misnomer, I generally use the martial arts term cat stance
Now when you throw the right cross or hook, the hip and rear foot should pivot in unison, in to the point of power