Yes your 7th house is weak for marriage and that is why you are getting delayed results. Matching should be done after proper matching of the horoscopes for a happy married life. Strong changes of marriage are after November 2017. regarding Mangal dosha, you have partial mangal dosha, which is not very strong. If you do proper matching it can be ignored.
Blessings,
Navneet Khanna
Astrologer