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@clubman
A little anecdote that had slipped my mind when I first responded to this q.
Some years ago a clubmate had two events to ride over a bank holiday weekend, a road race and a time trial. My friend is a good mechanic and a man who always likes a spotless presentation of himself when racing, so during the preceding week he dismantled both his TT and road bike, carefully polishing and checking as he reassembled them.
Over the weekend, against pretty strong opposition, he won both races.
It was only afterwards he realised he had muddled up the cranks and had put the 175 lh crank from the TT bike onto the road bike, and the 170 road crank onto the TT machine.
He tells me he hasn't worried overmuch about ideal crank lengths since then.