first i think spreading flames and and flame of xolti are useless: the burn to death combo does damage over time, burst dps is better i think in pvp.Demonic suplication have a long cooldown but really usefull in pvp!
In possesion tree Burning word is crap (around 300 damage @level 80hox lack of survavibility,phoenix cloak is really awesome so improve it with phoenix wings can be good.
havnt tried molten flesh yet.
here is mine actually (anyway i often change feats)
http://www.conanarmory.com/feat.aspx?id ... 2ef4ef4ef2