How critical job, how much time, how much money...
- I would go to next fixed points
- I would take the old lines up to points that error in connection is acceptable
- I would manually calculate connection point movements and enter them
- I would just use general pipe design rules/experience and forget CAESAR.

For me no general rule (except that I would always start from the last item). During the last 2 months I have used all options in my calcs. Each job is different.