Sounds like the main problem is tyres. Best advice is to run whatever the fast guys run at the local track. On UK tracks that would usually be Schumacher yellow minipins, maybe stagger ribs on the front. You mentions slicks and additive - are you perhaps racing against touring cars? You will never get the buggy to handle like a tourer.
Keep the transmitter settings simple. 50/50 on the throttle and use the ESC to adjust feel. On the steering side, use the EPA to get full lock (no more, no less), then use the dual rate to decrease steering lock if you need to (probably not on a buggy indoors)
Car setup is equally simple. If the car is well built according to the instructions it shouldn't be too far off. Generally carpet favours stiffer springs and oils.
The ezrun is sensorless so may not be as smooth as the sensored systems most racers use. That probably won't cause you to spin out though unless the throttle is cogging especially badly.
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