Even your three practice and one race events would have started to weaken your plastic gears. Think about the impact it takes when landing on say one wheel from a jump.
One little burr on a plastic tooth will slow down the servo speed, where metal gears can cope with it all day long. Eventually your going to strip it so better to spend some money rather than loads of time fixing.
Metal geared servo,s have a plastic saver gear for very severe impacts which has only happened to mine once when I let a national tc driver have a go.
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