You stay on your rear foot toe first off. You use that toe to pivot(twist) Most power shots you throw should be thrown from the body. That means youre twisting your body to throw the hooks. uppercuts you simply twist a different way.
Your entire body should be twisting.
You pivot from your toe, twist the hips, put some ass behind it for power, the the shoulder line twists.
Look up hooks on youtube and look for boxing links. Those are the ones you want because boxing exaggerates the twist motion when you see demos.
You're probably just throwing arm punches straight from the muscles and shoulders. That's a no no.
Once you get used to the awkward body motions you will telegraph them less, and they will be an instinctual part of you. Throw overexaggerated loopp shots at a heavybag for about 2 months and you'll get used to them.