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I too have always geared my sleds down....until the 2012 etec.
I am now gearing them UP. They went a little past that sweet spot IMO, at 19/51 on the 163 you cannot gear them any lower, they were 19/49 on the 154's. I am told the '13 will be the same but have not seen them yet.
I put a 21 on top, gets rid of the dogleg and puts the gearing right back to the ratio I have always liked with the TRA in the hills with a big track.
I should add....on the '12's the "X"'s and standard models are geared differently.
Is there room to go from 19/51 to 21/51 with stk chain?
What gearing did you settle with on the 3 inch?
Do the 12s and 13s have the same clutching?
Does the21-51 work a lot better then the 19-51?
Thx