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If it is slowly oscillating in RA it is probably an issue with settings in PHD2. Backlash in RA is not generally an issue as the RA does not reverse like the Dec does. At maximum guiding rates (1X) guiding east stops the RA completely and guiding west runs it at 2X sidereal rate. What issues are you having in calibration? If it does not calibrate properly you may be in for trouble all night.
Regards the altitude bolt, My payload is not particularly heavy and the bolt is a little stiff when raising the RA, as was mentioned previously, there is quite a bit of mechanical advantage between the weight on the mount and the alt bolt. And yes, there is play in altitude but it should not make any difference once you are polar aligned, if you fiddle around and remove the scope or something else that jostles the mount it would be wise to check the PA again as it may not come to rest in quite the same place if you take the pressure off the alt bolt.
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