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@dancing james
as i said in my earlier post 1/2cm difference can make a huge difference.
these are the main variables (assuming your frame is even near a correct fit for you):
saddle height, saddle position with respect to bottom bracket, saddle to handle bar length, saddle to bar drop
you then have to take into account a riders degree of flexion, core strength etc
generally peoples legs are not the same length, so wedges may be required to even this out too.
at this point the simple option is to pay someone who knows what they are doing to make it right
cyclefitting is a mixture of science and voodoo art
if you are having regular pain etc then pay someone to help, or spend months fiddling around, buying different stems, spacers etc and still not get a correct fit.