With regards to the survey, would you consider adding a third option to each of the answer sets to cover null cases (i.e. not applicable or insufficient information). Alternatively giving context in which the statement's made (e.g. previous 4/5 comments from both parties) may help.

e.g. "I am a guy"

    -1: inventive/curious
    -2: consistent/cautious

#2 given it's a simple statement with no follow up question.

    -1: efficient/organized
    -2: easy-going/careless

#1 as it's a statement with no fluff or politeness surrounding it.

    -1: outgoing/energetic
    -2: solitary/reserved

Hard to say. I picked #2 as it's a short answer trying to avoid more conversation, but depending on the context could just as easily be #1 (e.g. "Do you like sports?").

    -1: friendly/compassionate
    -2: analytical/detached

As above; opted for 2 because it's a statement of fact (but again, if the previous statement was something like "Do you think Natalie Tran's attractive" it could be #1)

    -1: sensitive/nervous
    -2: secure/confident

This is the hardest one each time. #1 - they're trying to give short answers to move the conversation back to the other person / away from them. #2 - they're not waffling on nervously, but are communicating clear and simple facts (with confidence?).