Cult: soil testing

A friend is working at a soil testing lab and they do free testing for
employees.  She got her results, but then wondered what the optimum soil
constituents should be.
 
I didn't do a search, but wondered what the group's opinion on this might be.
 
Oddly her pH is 7.9 (we tend to run neutral in Nebraska)  Irises grow in a
good range of pH, so if they are growing well, would it be better to leave
that well enough or bring it more towards neutral?
 
Thanks for your help,
 
Robin Shadlow
zone 5 NE
 
working outside!!! almost had forgotten what that felt like  :  )
 

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