Also whitehelm, for 40 glory I think, is a bit bleh. I also have my khetar troops high level, I'm not saying it's hard, just definitely not worth the time. 8 matches without a reasonable way to use valk, for the one resource valk provides, more generously than the task offered, also, I wouldn't take my khetar team into pvp Because it's just not that good. For others it might work out, but for me trading 24 glory, 400+ souls, 5600+ gold, for 116 souls and maybe 1000 gold (that is if both scenarios took the same amount of time, which they dont, my pvp teams are faster.) Isn't worth it.
I'll still do those tasks once in a while to finish a quest line or maybe to 5 star some challenges since most of mine haven't been completed, but usually I just leave them alone.