My people were from Baden too. The Koellner's and most of the Caesar passengers are on my family tree, mostly by marriage. I have managed to link most of that ship to my family tree through one way or another. I have been joining the Bega Valley & the Monaro (where many of the families ended up) together through genealogy for over 20 years. I knew about the James Manning connection, as many German immigrants who arrived in my area in the mid 1800's were sponsored by him. I descend from the Beileiters who were related to other families on board the Caesar.
Likewise, I will be taking another look at this area of the tree, having come across your posting. I'll let you know of anything I think might be useful to you.
Good luck & happy researching,