Something you might want to try... your external SD card is known to your new Droid as sdcard-ext. I think Titanium looks at sdcard by default. That's your internal storage, not your removable card. You can use something like root explorer to copy your titanium backup folder from the sdcard-ext (removable card) to the internal memory (sdcard). That's why I had to do with mybackup pro.
Also, Titanium has a preference for the backup folder location. I think you can go to preferences within titanium and have it search your phone for the the folder location (it auto scans). Either or both of these options could work. Neall
Update: Titanium's built-in directory search will search in the sdcard-ext directory so try that option and it should find your previous backup.