There is an ImToo subforum here at cdfreaks: http://club.cdfreaks.com/f140/
I suggest looking in there for specific answers and guides to using that software.
I don’t use ImToo products, so I won’t be of much use to you with them. But there are free alternatives for doing pretty much anything you want with dvds. Look through this thread to see some of the alternatives if you are interested.
We have a lot of guides to backing up dvds in the Copy DVD forum, and there are more around the net. Videohelp.com is a good site to learn about video programs.
When you backed up the movie straight to vobs, did you use compression or was it a straight rip? With no compression, it should not have played back with any choppiness. Try playing it in a free player called VLC