Hi Gunmender, that's cool as long as you feel the arrows group well compared to a bare fletched arrow.

It does not really matter how you measure it. Bare shaft tuning will determin the ideal nock point. The trick is to measure it when you are happy with it. How you measure it is up to you. I measure from my brace hight gauge ( a true right angle to the bottom of the arrow shaft on the rest) to the bottom of the nock. Nock points in books are only a starting point to tune from. 5mm to 6mm above square is a good starting point.