So is this more of a gripe than a bug report?
I'm sort of confused what you're trying to tell me here. If you don't like the added effort, which is arguably less for Drogo with his poison immunity than most other characters, then don't go there. Plenty of other people do, especially to the lower levels. The top level wasn't even designed for someone of 17th level, so the "reward" of going through there is going to be on the low side.
Funny thing is, the two spiders are nearly identical, with the same properties skins and the same creature attacks, though the Bloodback does have lower stats and fewer hit points. I didn't see anything last night that would make them significantly more difficult than the Dire Spiders. In any case, there's nothing "wrong" with them, and so I don't see a reason to change them.