Delta 100 - ASA rating and dev time

Perhaps a bit of an old chestnut this one but I'll ask the question anyway. I've used Delta 100 for a while, I rate it at 100ASA develop it in ID11, 1+3, for the Ilford. recommended time. Results are ultra sharp and the negs are quite contrasty. However I have recently been advised that there is an opinion that better results (particularly shadow detail) can be achieved by rating at 64 ASA and reducing development time accordingly. Does anyone have any further opinion on this or experience of using Delta 100 in this way?.

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