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Yeah, I've read a little bit about it the last day or so and it seems the consensus is to go for a bigger rear cog to reduce wear and increase chain wrap. However, there seem to be far fewer larger chainrings available (greater than 38t) so I might wait until the last minute before deciding. There's plenty of work still to be done, so I have time to do some more calculations and testing.
I’d say, go with a larger rear cog, a 12t can wear out and start slipping quite quickly.