Here's a picture of my chainline:
Some time ago I've accidentally broke chainring during sprint, big theory is that one of screws was loose but I won't ever know. But seriously, I did not start this topic to argue but to find out which chain to buy. I've said that I've tried higher-end KMC and Wippermann Connex chains(those fancy recommended models) and they didn't last any longer than cheaper chains that I was using before(normally when I ride a lot I have to change chain 2-3 times/year). In fact I remember that I had literal no-name chain that lasted longer than those two mentioned above. On my geared bike I had good results with SRAM PC-850 and as I wrote earlier I suspect that their "delta-hardened pins" actually work but I did not find anything like that in SRAM's 1/8" offer anymore.
The thing about me overtensioning chain is absolutely correct, I did that in past but I learned hard way so I'm always trying to leave that little slack in tightest spot.