This works. Credit to Matlabber-
You can assign a variable containing export settings using 'factorystyle', view them all by typing variable, then modify as needed:
NewStyle = hgexport('factorystyle');
%%view all settings:
NewStyle
%%reset appropriate settings:
NewStyle.FontSizeMin = 4;
%%export figure with new settings:
hgexport(fignum,'-clipboard',NewStyle);