Question: Going from 20% to 30%

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ya 20% is baseline, that will change when u increase the nitro content, u will need a greater deck height but u still get more power. It is mostly a wear issue. If u run 30% on a motor shimmed for 20%, (I am not saying this will happen in every case and will vary b/w motors), u may have a motor that is just a bear to tune, because a half hour either way will make u overly rich or overly lean, the motor will prolly run faster, but it wont be long till u pull the rod bushing throught the bottom of the con rod