You use the term "most efficient velocity" when really there isn't one. There is however a "point of diminishing return". Maybe that's what you mean?
Theoretically, the heat dissipation would increase indefinitely, along with the flow rate. There is a point however, where a very high flow rate doesn't provide much more cooling, than it's slightly slower counterpart.
Then there's the cost of putting a high flow rate through a rad (expensive pump), and there's also physical limits (pipe burst), but that last one is way up there.
Heatercores I found, are tested to about 30 psi. You certainly can't count on even half of that, if it's used.
I don't know about your radiator. From your measurements, it would be comparable to the Lytron 6220 (copper, 4220 in SS), but the Lytron looks like a single pass design, where yours looks more like a 14 pass design.
The 6220 is by far the most restrictive of the Lytron copper rads. If yours is multipass, then you could probably compare the thermal properties, with some adjustment in the numbers.
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