Since YOU don’t know what Hashem has in mind for you, my advice is always to continue until you know for sure its not for you. If you feel you are settling because s/he does not meet all the criteria on your list, then my advice to you is “throw out your list”. Most people never get even 20% on their lists and that is why the lists we make up are foolish. We only THINK we know what we are looking for and that’s because we really are not looking for OUR bashert. We are looking for our dream and fantasy of a spouse. What we really need to be searching for is who Hashem picked out for us. So he might be shorter than what we really wanted but that doesn’t mean he isn’t our bashert. She might not be as thin as planned but that doesn’t mean she is not the right one. Are you getting my point? That is not called settling, that is called understanding.
If you date someone and you find the qualities and values in that person that you can respect and admire those are things that are important and you should continue to see where it will lead. If there are minor things that irritate you, then maybe those things can be discussed to see if they can be fixed or if they are really important enough to give up on the shidduch. For instance anyone can change their appearance with a little bit of help. A person can buy new glasses or even contacts. And with a little help in the wardrobe department, a shleppy looking person can be taught to dress a little more dapper. But you can’t change a person from the inside out. Height and weight are not as important as a good heart and soul.