i honestly don't remember how long after purchasing the f8500 i did the first calibration. i did not buy the meter until at least a few months after getting the tv(i just don't remember if it was like 1-2months, or 6-8months). the posted 'before' readings are from the first session i used the meter.
i THINK, that on mine, warm2 started off too green/yellow which is why i used warm1(which looked more bluish, which i find much easier to get over). it's been a long time since i checked with the meter, but i have not noticed anything major in the 2+ years since i calibrated it. it seems possible that colors would shift, given enough time, but i can't confirm that from my own set.
wish i could be more helpful... have you tried increasing the red in the 2pt white balance more aggressively? is it possible to give it a red tint? my assumption is that if you can make it 'too red' then there should be a setting that makes it 'just right' somewhere in between. if you have a good feeling that it can be calibrated out, then might be worth the cost to get it done again.
Displays: Samsung PN64F8500/JVC X35
AVR: Pioneer VSX-1130K, 7.1/5.1.2 audio
Sources: HTPC(Enby), PS3, XBOX360, Wii
Control: Harmony One