Urfahr is on the left bank of the Danube. Most of the Linz proper is on the right side. If the family resided mostly in Linz-Urfahr, the number of parishes to search would go down considerably.
As to your files, could you select the emotionally less taxing ones and post them? For istance, the work book?
You can send me files to my e-mail address fritzkoe at comcast.net. However, I have not always time available. Maybe the other helpers (Mohnbauer and Hallpark) would also be prepared to interpret some of your files.