It’s a bad idea to get involved in those situations (eating with teenage girls and young daughters at the shabbos table).
While shidduchim can be made at the shabbos table, and we speak of setting up our daughters (u’le shadech habanot)in the zemer Mah Yedidut, in many cases, I don’t even think the parents are interested in introducing their daughters to these guys, in which case, these men are merely being teased and their libidos antagonized by what they can’t have.
I spend my shabbos meals with either bachelors, or with older folks. No hirhurim involved there, at all. I agree with Wasserman.
Go to many shadchanim, try out JWed (frumster) or Saw You At Sinai, or even try singles shabbatonim (although I think you’d have more hatzlacha with the websites or shadchanim).