800xA Trend Table Formatting
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The number of decimal places can be controlled via Additional Info attributes used by Generic OPC and a few ABB generic Connect packages, eg 800xA for Advant Master.
Check out the Control Connection aspect's tabs and settings.
AC 800M RealIO variables have a set of sub attributes that propagate to the trend, eg Fraction (decimal places).
PLC Connect has support for presentation attributes too, maybe only via Signal Configuration aspect and Deploy.
In lack of automated support, use the Property Extension Info aspect or make override in the Log Configuration aspect.
Changing column names is more difficult. NLS packages can change them - can't tell if you can change this outside using a bona fide language .DLL though? I believe it should be possible, somehow.
File a support case with your regional ABB Support Center.