I've had modest success trading the first 1.5-2 hours of the pit hours of the US corn contract. However probably 1-2 days a week there aren't any good setups (or none that I can see) in Corn in the first couple of hours.
I'm thinking of trying to trade YM as well as corn. However I'm not sure if I'm better off devoting 100% attention to one instrument and just being patient and trying to increase my size when there are opportunities or whether I'm better off dividing my attention between two markets.
For people with experience do prop shop traders etc. trade multiple contracts or are they specialists?