You have 8, five-multi-dimensional intergrals to solve and find minimum. You needs a lot of computing power to solve this.
I'm used AdaptiveMonteCarlo method, it very fast but is a large spread of data,the results are not accurate.My old laptop is overheats after several hours calculations.

Probably changing a better method of integration to GlobalAdaptive or Another can accomplish something.
Good Luck.
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