Before I start, I just wanted to say the Warden HoT / partial BPE buffs have made a world of difference - I took Iyvan out in the Moors today and was able to hold my own against 2 high ranked wargs, took one of them down and nearly the other one before the other came back from the graveyard and finished me!
Anyway, it seems that Never Surrender still has that annoying bug where it doesn't proc all the time. It happened in the moors again. I get the feeling this is probably a known issue that there isn't an easy fix for - I suspect that's why the morale trigger was increased to 10% instead of 5% to reduce the window of the problem occuring. Just thought I'd mention it again though in case it's slipped through the net.