At this stage, yes, it makes very little difference.
Otherwise, people have switched an Eheim 1048 for a 1250, and haven't noticed any improvement, so the whole tee thing, IMO, is really futile. But... also IMO, the tee needs to have the flow run through it at 90 degrees, to be able to extract some air.
On the other hand, running the coolant straight through should work, but the straight run would have to be horizontal, and as long as possible, to allow air to escape vertically, up the tee.
As for the manometer... set this up around your pump (with a complete loop, including core and block), and I'll post a curve of the Eheim pump on the next post.
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