I can't see the whole room, so I don't know your limitations, but if you can, raise the speakers up on stands so tweeters are approximately ear level and set them further apart - about as far apart as you are from them while listening.
Also, lower the TV to approximately eye level while sitting and watching.
Get a better sub if and when you can afford it.
Now, I know you are a renter and your landlord would likely frown on you fishing wires through the walls, but I would research ways to hide or at least mitigate those wires. They would drive me batty; I would have to do SOMETHING to conceal them better. But if you're O.K. with it, just ignore me.
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