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I wouldn't worry about not increasing compression ratio. Bikes have a good compression ratio already, and by the time you get to 13:1 the law of diminishing returns is really setting in (practical limit is thought to be about 14:1, you can easily lose power and efficiency by going up to 14:1 if you don't design the combustion chamber properly, and little to nothing is gained from going up further to 15:1). Think of it like this, by Atkinsoning your 12.x compression ratio bike engine you're lowering effective compression and burn temperatures to what a normal car engine from the late 90s burning 87 gas is at. Could it be better? Yea, some car engines have lower bore/stroke ratio and high compression as well, but your bike engine has less friction thanks to the shorter stroke and can hit 10000rpm or something and make fantastic power. Car engines don't have that flexibility and almost all of them have lower compression ratio anyways, so you're in pretty good shape.
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