Those Half link chains have already started to lose favor among most of the guys who originally loved them in the BMX world. They're problematic, make loud popping and cracking noises at times, and although on paper they seem oh so durable I'm here to tell you I've replaced several on bikes for guys who broke them rather suddenly and under possibly dangerous circumstances. That's all just BMX'ing too, never even seen someone use a half link chain in an allpication like this before.. Just a little perspective for you, take it and do what you like with it. Otherwise, your tensioner looked fairly ingenious, albeit in a Rube Goldberg kind of way. lol
Good luck troubleshooting your problem.