for what it's worth, when I got mine, I adjusted settings to what I felt were 'correct', not lowered beyond that(so contrast was at 95 I think). I did run some slides at night for about a week to speed things up. but really the only precaution I took was I avoided using the tv with my PC for a couple hundred hours. I really believe this is one of the most ir resistant plasmas ever made. or maybe it's just bright enough to hide the ir better than the rest, haha.
Displays: Samsung PN64F8500/JVC X35
AVR: Pioneer VSX-1018AH, 5.1 audio
Sources: HTPC(Mediabrowser), PS3, XBOX360, Wii, Sony DVP-CX995V
Control: Harmony One