1:43 PM, Friday July 30th 2021
Sorry for the late response, I was a bit busy.
If doing large ghosting lines is being difficult try to a warmup of 10-15 minutes before doing the next exercise and then tackle it.
Start with putting two dots apart of each other and try the ghosting line.
I'd also suggest you rewatch and redo the Rough Perspective just for you so you can absorb its information better and improve the foreshortening that you are generating.
Next Steps:
Do 10-15 minutes warmups of large ghosting lines before an exercises session.
Try to rewatch and redo the Rough Perspective exercise so you can understand it better.