The constipation may be more in the thought process. JB
As Blue and others said, first there's the travel... my 5" Spot feels quite noticeably less plush than my 6" RFX and that's using the same shock... another big factor you didn't have, besides the obvious things like different bikes, tires, wheels, tire pressures, Tire volumes, Spring settings, forks...need I go on?
Then there's the RP3... I've never been able to get it to feel even remotely as plush as my DHX or Romic. Even using half the required pressure(hint, don't do this), it was squatty sloppy and STILL not as plush.
Finally there's the bushings... c'mon man... You have a ~500+# spring, a very effective propedal system and bumps that generate forces that far exceed both... the pivot stiction isn't even in the same universe as far as magnitude. We're talking about a single grape on a truckload of watermellons. Maybe it can be felt in a basement test but that's about it.
I'd say boredom or UGI is playing tricks on your mind.
Either way getting it Pushed will certainly get the Isht flowing again.
How do you like that Darren...now you're the master of constipation relief!