In fact, because of this, despite "the customer being always right", I generally refuse to create Strategies that do not trade on barClose. They take extremely long to optimize, and then when I actually run statistics on them, I discover that they are often just tightly curve-fit on a lookahead bias, and unviable.
Every Strategy that I have supplied to brokerage auto-trading partners enforces COBC=true. They can change it to false: I simply return it to true.
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