Think you should be ok on the speed, theres only 0.01s increase from 6v to 7.4v and even then it will only be 0.02s quicker than a 1258.
If it is to quick you can program the servo itself but not sure how you do this, think you need a program card or something? A shorter servo arm would also slow things down a bit if theres room and still enough lock or poss adjust exponential rate on transmitter to slow down initial response. I've done the exponential as it helps smooth out what my over eager thumb keeps doing.
Good luck with the new car
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