Congrats on missing the fact that you needed to rebalance this quest down to the newer crowd after breaking the ever living hell out of it. You ran off at least 1 new player I was taking along for the XP and credit in the first raid series implemented. We were a well rounded level 8-9 party, and it was like trying to complete level 14-16 content!
Fix it please, before you alienate even more new customers. It needs to be geared to level 8-9's, not level 16's. I certainly hope in MOD 9 that I don't see beholders throwing Wail of the Banshee in VON 3 on Norm-hard, but it would not surprise me at all.
The spell list needs to not exceed caster level 5. The damage output needs to be recalculated for characters that do not have Toughness coming out their ears(Keep in mind the caster types forgot what Resist:Energy was for a while). The ACs and HP need to be rebalanced to people wielding their brand new +4 Longsword. The quest needs to be made new again, as if people who have never run it before are just beginning to run it.
Seriously, stop tweaking the old content to "make things more interesting", unless you are adding a new hallway or something. Making something already difficult nearly impossible is not making it more fun, it makes it more frustrating and stressful. Frustration and stress are not fun. I'd think that by now the Dev Team was aware of this.
As for you Powergamers that will likely post in this thread, I hereby challenge you to Permadeath Play. You will run VON 3 as a level 8 Pure Class with zero twink gear, and very very few potions if you are to have a valid argument here(What this means: 28 point build, no multiclassing, no AH gear, no hand-me-downs, no tomes, just whatever you pull out of chests and can buy from a Potion Vendor, or Wand vendor respectively).
Edit2: The main problems were: The named Troll hits too hard and has a regen a bit too high. His HP needs to be tones down as well. The named Beholder has an AC higher than a Dwarven Defender and HP to match it, this needs to change. The Marut also has a very high AC and hits much much harder than he used to. We went in Hard because we had some level 9's in party and thoguht we could handle it(Mine was twinked too....) Total deaths for the party by the end of the quest were over 40(lost count after 30, but the deaths didnt stop). We were insistent on getting it done.