Bombed interview... mail a few months after.

I think the obvious answer to your question is to take the interview as others have stated. I think the less obvious answer that perhaps you are looking for but didn't express clearly is really what should you do to perform better on the next interview. Here are a few tips that you can implement to improve your interview skills.

Problem: Bad with skype interviews Solution: Skype more often. Skype your mom, dad, friends, family. Talking to a screen will quickly become more naturally. Even supplement this by turning on your video camera and looking at yourself in the video and talk to yourself. By this I mean do your interview rehearsal while looking at yourself. Ask yourself questions out loud, and respond to them out loud, do it naturally. Not reading from a pre-made script. This may seem stupid or awkward but thats what you are going for. Your biggest problem is that you find the process awkward, impersonal, weird. By looking at yourself and creating an awkward situation, you can become more comfortable with yourself as well as more confident in the way you come off. Take this time to look and analyze the way you physically look while you talk, Are you slouching? Are you making any facial gestures that convey insecurity or being uncomfortable? Where are you looking? How do you sound? Etc etc. use your own feedback to work on it and perfect it.

Problem: Don't mesh well with HR, but well with Associate Solution: Take it in stride. (easier said then done I know). But put it in perspective. You seem to have a predisposition to not like HR (as said by you). This is just a wall, and as far as walls go, it's a fairly inconvenient one. HR's can make your life a lot easier, as well as a lot harder, so make it a point to try and win them over. Recognize the difference between needed to mesh well with them vs. stroking them and working with them so they feel like they want to help you and want to give you what you are looking for. Remember that for the most part you will always find people wherever you go with whom you maybe don't like. But part of demonstrating your ability to get the job done, is by showing how you have developed this soft skill and can get along with everyone and do what you need to in order to get the job done. In this scenario, your job is to make a good impression with the interviewers, so make it happen. Also, realize that particularly you don't need to necessarily "like" HR staff, because you aren't working with them everyday. But don't interpret this as you not needing them (and yes I say need) to like you. So, ease up on your stance/pre-judment of this person and just look at it as a test. Would it make it any different for you if the MD told you that you were going to be interviewing with someone who was intentionally going to try and not work with you and is going to not mesh with you, but that this is just part of a test? Even though this may not be true, it's not to say that you should act any differently.

Lastly a piece of final advice. Get out of your head. You accomplished the hard part of finding an in with someone so now it's your to lose. All you have to do is not mess it up.

Good luck.