Pretty hard to advise without a clearer picture of what’s happening. You say that your cakes are uneven. Do you mean one side is higher than the other? If so, you probably do need to adjust your oven rack or oven so things are sitting perfectly level on the rack and not at an angle. Or is the pan warped? Oven heat terribly uneven?
But I’m guessing you mean that your cakes come out with a domed peak in the centre. If so, there are three possible causes: 1) too hot an oven; 2) over mixing; or 3) too much flour. If you’re also seeing tunnels and large holes in the cake, it’s definitely over mixing.
A more detailed description of exactly how your cakes are uneven would help others to help you solve the problem.