Offsetting text and editing axis titles in biplots?

[victorialindsay]

Currently using your (great!) tool for producing PCA biplots with the loadings on, however having a couple of minor issues.

Is there any way to edit the text on the axes? I want to also plot PC1 against PC3 etc and can't find a way to change the wording from PC2 (although the explained variance is picked up).

And I do have quite a number of variables, so the labels on the loading vectors currently writes over itself and is illegible. Is there a way to jitter or offset the labels?

Thanks for your help, this is a very useful tool.