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A resistor will get quite hot since it will use the same amount of current as the motor itself (which will be a lot). Also, it will mean your battery pack lasts less time overall since power is being wasted on the resistor.
The best way to reduce the RoF is to use some electronics to control the AEG motor and make it run slower and more consistent - but without wasting power.
I'm working on something to do exactly this as a matter of fact and will have them for sale. If you're interested, you can watch for an announcement I'll make for them in the next week or two.
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