i used to have an mi5, think the spool had plastic inserts in the drive cup which may well be worn, as spools are quite hard on them.
pinion will depend greatly on motor and where you are running the car, i ran 28 tooth pinion on a 13.5 but we run at a slippery indoor venue.
74 tooth spur will be needed for larger pinions and the 85 for smaller as there isnt much movement on the motor mount.
the reason some people use the finer 64dp gears is it gives more choice of gear ratio's, downside is it gets damaged much easier, just stick to 48dp unless you are just running on carpet
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