Yep, exactly what GA said.
Hi torque servo with alloy horn is fantastic.
I used to use a relatively slow servo, and when I upgraded to a high-end KO I was amazed at the difference it made. So I personally think the faster the better, those front wheels do a lot of work!
Low profile up top is a good idea though to keep the weight down but be aware the S9550 etc don't quite have the output in the centre, so some adjustment will be required to get it all lined up.
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