Optimize Engulfing Indicator Parameters

I already have the full source code for my Engulfing Candlestick indicator and it works, but I need its calculation parameters tightened so the logic properly accounts for the relative length and size of each candle... (Budget: $10 - $30 USD, Jobs: Algorithm, C# Programming, C++ Programming, JavaScript, Metatrader, PHP, Programming, Software Development, Technical Documentation, Technical Writing)