We don't check manual calculations. Actually, we created ICMIZER to avoid really complicated manual calculations which may take a few hours even for simple situations.
We permanently control ICMIZER results. That's why we believe in their quality.
Of course, if you are sure that you found an error in calculations, we'll consider it. Please, make a detailed bug request to let us quickly understand if the error is in our or in your calculations.
To discuss your calculations, we recommend you to use any poker forum where poker theory is discussed.