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@edscoble
It is down to personal preference, for those who's less than 60kg is likely to be comfortable on 23mm as they didn't have to pump it up that high, and of course depend on the road surface, Surreys for instance have appalling road surface that make havoc on your hand and arse with the amount of vibration going through you that a 25mm or even 28mm would not only make it more comfortable, but prevent the tyres from skipping while descending, provide more grip while ascending, and allow a smoother ride too.
There's no reason why you have to stay with 23mm other than conventional wisdom, the 23mm give the illusion of speed with the road buzz, but in reality doesn't make you go faster, just feel faster.
Even Hippy have 25mm tyres on the rear when he did the 24 hours Mersey Road TT and did 518 miles.