Originally Posted by
Teakwood
I think option 3 is the best one by far. Also, you might want to consider rewarding players with hints towards fighting certain NMs, possibly within Adoulin quests or as the result of the progress of various Coalitions.
The fights -don't work- as zerg fights; you're not going to be able to just zerg them down in 15 minutes if they update it just like you can't do that right now. If you can't beat the fight in 20 minutes you're not doing it the right way, and I think it's -really- insulting to the players to have monsters that go into rage mode in 15 minutes and become unkillable knowing players won't want to give up and will just leave the monsters up for a long time and wind up feeling miserable.
I'm definitely staying away from Delve content for a few months until updates sort themselves out (and I get my THF sub leveled, which is a thing I guess I have to do now) but this would be a good place to start.