Torah
I totally get your dilemma and this similar thing happened to a male friend of mine who is now BH happily married. He dated a girl who on paper seemed to be everything he was looking for. She really was a good girl and what not but the feeling wasn’t there. He had to say no but had nothing to pin it on. We had a long discussion about it and in the end we came to the conclusion that he just has to stick to his guns and say the chemistry was off. He told me that the Shadchan didnt want to take that as an answer. He really had to keep asserting himself that she is just the wrong one. Its amazing. Had he said he finds her boring or unattractive….she would have taken that no in a minute, but no chemistry which is the most valid reason to say no she would not accept without him being firm about it. So there may be some resistance from the Shadchan you should ne ready to be firm about your no and don’t be sweet talked into another date.
Hatzlacha