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Monoloop Hydronic heat & circulator piping

I am troubleshooting a one pipe, one zone hot water system with differential/venturie tees. It is providing little to no heat to the second floor radiators & first floor rads near end of the largest branch. They were bled and the circulator is running but it has an odd configuration The out feed for the circulator is 1 1/4 and leads to an existing copper branch of the same diameter. But the infeed is a 1" fitting in a reducer tee (1 1/4" in two 1" lines out - other feeds an indirect water heater). Can this single point of construction stiffle the entire branch?

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