ggbiplot - How to change the position of arrow labels

we have the results of a PCA done with prcomp(). Afterwards we plotted the results with :

ggbiplot(PCA_Hochfl,  labels.size = 2, varname.size = 3.5,  cex=c(5,1)) + geom_point() +
         geom_text(aes(label=ifelse(mw_H$Group.1 == "H14", as.character(mw_H$Group.1), ''), 
                   hjust=1.05, vjust=-0.2)) + 
         geom_text(aes(label=ifelse(mw_H$Group.1 != "H14", as.character(mw_H$Group.1), ''), 
                   hjust=-0.15, vjust=-0.2)) 

We have the following result:

As you can see on the left: the labels from 2 arrows are on top of each other. How can I move one of the labels downwards while moving the other upwards.

We would really appreciate some help. Thank you all very much in advance. Best, Helena