How do I fix this bullet Movement?

So I've got this rocket being controlled via a control stick. The problem is that the rocket goes crazy when the control stick is used. I did set bullet gravity to 10 on drag StickM, which did smooth out the movements of the rocket but it still moves awkwardly. The world gravity is set to 0 because that's the environment my game will be in.

Here's the Capx. Initially the bullet does not have any gravity on it, adding a gravity of 10 will show you what I mean by making the movements smoother.

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Wow, this is quite extraordinary. You managed to make the movement more accurate! But I did notice a reoccurring problem, once the rocket is moving, it shifts forward a little at a time. I notice it more on mobile, is there anyway to fix this?