Stax F-81: Make a great speaker better?

Just bought a pair (second time). They sound glorious with Manley 200's. First time around amplification was not up to par(Moscode600).Looking for intelligent opinions on ways to make this incredible speaker better. Power cords(so far MIT Z-cords have made a significant if not overwhelming improvement, speaker cable(Siltech, power conditioners(they do sound a bit more refined plugged into a Power Wedge). I am most curious about a mod that I read about and can't remember where: the removal of the RC network in the power supply. Thank you all ahead of time.