The missal I use says Pius 12 restored the old traditions so that the ceremonies took place at the corresponding times to the actual event. So the easter vigil was a night and not during the day of Holy Saturday.
Is this true? If it is isn't a good change?
As I see it, and I believe that most of the Sedevacantist clergy also do, the problem is not the time that the ceremonies take place, but the actual rite. If you read about the changes, you can see that there is absolutely nothing good about the reform, except the times. There were violent changes, and they all kind of give away what would be done later with the promulgation of the Novus Ordo missal.
Between 1951 and 1955 there was an experimental change of time of the ceremonies, so we had the old rites in the "right" times. This could be the best course to take, although I see nothing wrong in having the rites always in the morning. As far as I know, they started to be celebrated in the morning around the VIII century. It does not seem wise to revert changes made 1100 years ago. Not to me anyway.