I know old threads come up in searches a lot so posting a follow-up here on what I finally decided.
I've decided on a mixed diet of Victor Nutra Pro kibble and (likely) Northwest Naturals raw. If you are reading this from the far future you can probably stop reading here...
<minor rant mode>
I kept researching this topic and ooh boy is it ugly. I have a science background and the amount of pseudo-science and gut calls made based on a sample size of having raised a couple puppies out there on the internet is staggering. It didn't get much better locally. I visited 4 different local boutique pet food stores and only managed to find one person that seemed slightly educated on the topic. I won't go into details as this is minor rant mode and not full on rant mode but I'm highly disappointed in the whole "science" of dog food formulation.
</minor rant mode>
My conclusion is that ideally I would feed a pure raw diet but both financial and time considerations make that impractical. Additionally I like to do a lot of hand feeding with a puppy and want a kibble to do that. And it is not convenient for travel and/or boarding in the future. So a mixed diet of kibble meals and raw meals it is.
For the kibble I'm going to start with Victor Nutra Pro. It has the right amount of calcium per kcal and the right calcium to phosphorus ratio for a large breed puppy. It is high in protein and is grain inclusive. For what it is worth it seems a popular choice among GSD owners. I also like to rotate proteins and Victor has a number of other products suitable for that. (I want to see that Nutra Pro is working well before I start any rotation.) Of course after all this I'm sure it will be too rich for him or something else and I'll have to go to plan B.
For raw, once he is on a kibble that seems to be working, I'm going to start with a pre-packaged frozen raw. Northwest Naturals has a number of products that are acceptable for large breed puppies and comes in a larger bag of smaller nuggets which is convenient. I really want to try: https://rawdogfoodandco.com/
but the calcium to phosphorus ratio on most of their products doesn't seem to be suitable for large breed puppies. I'd have to either do the math to see what the combined diet looks like, supplement with other things, or just wait until the puppy is an adult. Regardless I have some time to worry about that and for now certainly a pre-packaged raw food is more than fine.