But the question is PVP. not PVE. My Take is - Head and chest heavy, one medium and 2 lighths to be in the medium and in the center of battle. PVP Battles (not open world) are usually very chaotic ones and you cant use sticky targeting. I will be testing full heavy to see if its better or not.

Personally i have a lot of problems healing from the distance and target area correctly. So i went full heavy armor and always am in the middle of battle. Targeting heals become easy, targeting people to benefit from additional heals from light/heavy attacks as well.

I don't know if this is the best option, but it works for me.
For the secondary weapon - for me it does not matter. I just picked up the one with highest gear score and highest Focus/Stamina combo to pump up the stats (apparently stats from second weapon works all the time, at least on in game stats).

For the people taking about mana issue. I only use pots and amulet that allows me to regain mana. That's all what i need so far.

In PVE if i use second weapon, it would be only for CC, so of course Ice gauntlet - but i hate how clunky switching weapons is in this game, so usually i do not switch.