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Generally speaking, your car is fine. LTFTs between -5% and +5% indicate relatively balanced fuel trims all things considered. Since you are hovering around -5% at idle, your car is running slightly rich (pulling fuel, hence the -%). At WOT, all fuel trims (STFT and LTFT) peg at 0% as the car switches from closed loop to open loop, so your observation is exactly as expected.
To be 100% sure of everything, we would need to know your STFTs as well. If they are wildly off, it could indicate a problem depending on the direction. Also good to know if you have any mods that affect air or fuel flow/metering or exhaust gas travel paths.
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