It's really unnecessary to scale the figure to fit with your text. Better yet, make the figure very large and then crop it when you export your plot. export_fig crops automatically.
Start by setting the units of the figure and axes to centimeters. By doing so, you avoid the rescaling of axes that occurs when you use normalized units and change the figure size. Then increase the width of the figure and move your axes horizontally by the same distance.
Here's an example
figure('units','centimeters')
ax1=axes('yticklabels',{},'units','centimeters');hold on
plot(1)
t=text(-0.65,2,'testtesttesttesttesttest')
FigPos=get(1,'position')
set(1,'position',FigPos+[0 0 10 0])
ax1.Position(1)=ax1.Position(1)+10;
export_fig(1,'-jpg','test')
See attachment for cropped output.
