I hope @Alethia has some insight, but that "proving ties to home" can be a real bastard to get in writing for young single guys, no matter how honest their intent. Your time frame is obviously horrible too, trying to get a face-to-face interview to beg your case is going to be extremely difficult. Yet another example of always getting Visas approved before spending money and making solid plans.
Kudos to you for such a well written and comprehensive post though, your command of English is excellent.
Good luck. I hope Alethia can offer something positive...
This thread (and others like it on this forum and elsewhere) leave me in complete amazment. This is beyond being naive, innocent or clueless, it's well past complete idiocy. I can't belive how utterly stupid some poeple can be, falling for these shockingly obvious lies.