Thanks again for the replies here. To close the loop on this, the advice offered by M'Bob, wwhntr, Time Exposure, and pitpro is absolutely correct, and worked for me. The amount of bend you need to put into the clasp is almost imperceptible - yet it makes a big difference.
Also, here is a set of vintage instructions (albeit for a Rolex Jubilee bracelet), that I came across this past weekend explaining how to do exactly this: "How to adjust the 'snap' of the clasp".
Perhaps there was something similar from Omega?
cheers,
Mark
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