Harry, if I'm following you correctly, you're saying that the fore end that came with the new set of barrels goes on, and the latch is partially engaged, but not flush? Then I'm assuming the unhooking pin is fully pushed back in.
Even if the unhooking pin were only partially compressed, the cocking hook should stay engaged.
I think I'd still like to see the extractor stop screw removed to see if it cocks, but you could just remove metal from the underside of the barrel lug to let the tumbler fully engage the lug. This wouldn't be my first choice, since removing metal is hard to undo.
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