You've seen a 74Kingz been used tensioning up with no slack because frames have different length chainstays, people use different gearing, and some chains stretch more than others. An old mech can look good, and maybe its just my old ways but i'd rather something worked than looked good. Rohloffs can use a wide chain, may need a spacer either side of the jockey wheel though. I think everyones given you the answer (get a double wheeled tensioner), if you wanna take the (good) advice and solve your problems then do it, if not carry on with a skipping chain that may or may not sort its self out over time.