Ashtkoot guna milan is important but it is not complete horoscope matching. The most important is checking the planets between both the charts. In the horoscope, the 7th house is the most important house for marriage. and checking the strength of the 7th house determined the level of marital happiness that will be there. If the 7th house is influenced with malefic no matter how much matching you do, the marriage will always have major issues. As there is Naga dosham, there will always be issues. Need to check in detail and do some remedy before marriage.
You can check the Paid services “Horoscope matching kundli milan” from the link below for a detailed horoscope matching report. The charges are Rs 2100.