After monkeying around with paper developers for 30+ years I am of the opinion that the final print is about 98% due to the paper and 2% due to the developer. I've tried them all, Muir's maximum black developer, Amidol, adding old developer, you name it, I've tried it and the resulting print is almost indistinguishable from a print developed in D 72 or Bromophen or one of the other common developers. Having said that, choice of developers does seem to affect how a print tones, but not to a large degree. Instead of worrying about exotic developers I would concentrate of trying to master the skill of burning and dodging which has a much greater effect on your prints than the minuscule changes you might get by changing print developers. I well recall the advertising blurb from Fred Picker trying to sell his "wonder developer" he said that his developer avoided the tendency of Dektol to "dump high values" whatever that meant. It's a good thing that Saint Ansel didn't know about this fatal flaw of Dektol. Mind you, Picker would say anything to try and sell his products and silly me did buy his spotmeter.