There usually isn't much/any PvP testing on the PTS beyond duels, and those aren't really representative of most "real" PvP situations. That said, I'll probably still lean towards running Reinforced on chest, legs, helm, and possibly shoulders, with Impenetrable on the rest. It's also possible to run Nirnhoned on light/medium gloves, boots, and belt, at least if Malacath stays really widespread.
Reinforced heavy chest in gold quality doesnt even give 1% damage mitigation. What a waste of a armor trait.
For me i will Go 4-5 impen and rest Split in sturdy and well fitted.
You dont get crit resist from CP anymore unless you want to waste a Skill slot for it so your crit resist will already be at around 2000 crit resist. Sure crit chance is lowered but If you get a crit hit it will hurt. So i better build for some mitigation in that way.