That's an expensive piece right there with all those belimos and copper clamps. Nice job.
Why the circuit setters on the bypass?
I spoke with the engineer about that. His explanation was that the bypass circuit setters are there because they were worried about the bypass loops having less resistance than the hot water coils and not receiving proper flow.
I said OK your the engineer. I personally would have just done a primary secondary loop with 007's or a comparable Grundfoss. Lot less expensive and no balance issues.