Unfortunately, dating feedback is almost 100% indirect and/or nonverbal. If I know a girl really likes being with me, but I don't like being with her, I'm not going to verbalize it, because it's cruelty.
You say you're not adept at picking up social cues. I think you're better at it than you are willing to admit. You just don't like what the social cues mean. No one ever needs to wonder after a date whether the other person wants to continue dating.
A simple, "I really enjoyed our time together the other night. I'd like to see you again. How about tomorrow. We can do such and such."
If the girl is interested in the guy she will say 'yes'. If she has previous plans, she will break them to be with the new guy. If she puts you off, doesn't answer IMs, or is less than enthusiastic, the message is: "I don't want to hurt you. But ..."
Just picture how you would respond if she said, "I really like you! Would you like to go out again?" She wouldn't feel any different hearing that from you, if she likes you. Picture what you would be willing to do given that comment.
Would you be willing to cancel your plans to be with her? Would anything stand between you and being with her? If she sent you an IM, would you answer it? She would feel the same as you do if she likes you.
People make a decision about others within five minutes of meeting them. So, learn from experience. Your not going to get a line-item feedback list on any date. If you have to ask her, "It won't hurt me if you don't, but could you please tell me if you like me or not, and if you don't, could you please provide useful feedback to help me on future dates?" You've blown any possible hope.
That's just not the way it works. By being honest with yourself, and making an honest assessment of your appearance, personal hygiene and body language; you can discover areas that might need work. But no date is going to tell you that stuff.
Trust me! I have more experience with dating and women than anyone I've ever met, or even heard of. Each date is either the beginning of a lifelong relationship, or it isn't. Those are the only two things that can happen.
Before a girl will accept a romantic date (just the guy and the girl) she must entertain the possibility that there is at least some bridegroom potential. Otherwise, she's wasting her time!
The guy in order to ask a girl out must also entertain that there is some bride potential. Otherwise, he wouldn't ask her out! A date is a mutual job interview for the position of spouse.
Some people might not like that, but it remains the case.