OK, JW, you are spot on this time....the option for a start-assist device on a regular refrigerator does signify issues, whether it be a restricted system or simply an internal compressor issue.
And Trout, your comment about run time really makes no sense. A hard start kit only bumps the start windings for a split second, then it's out of the circuit. You can run it till the cows come home, cause it is not doing anything after the initial boost to the start windings.
MajorApp, you cannot oversize a hard start kit and do damage. Just be sure the compressor windings are not grounded. Use a mega-ohm meter.