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That information was supplied to the transformer manufacturer.  That webench report and all the transformer specifications were supplied to them so as a newby I just trusted they would have built to spec.  Primary leakage inductance was measured (by the transformer manufacturer) as 0.25uH (250nH), even primary inductance is much higher 125uH (not 34uH).

Do you think it's worth me persevering with this transformer (I have invested in PCBs and assembly of all the associated parts) just to see how much power I can reasonably get out of it?  Or is it a lost cause and I should shift to alternate topology.