50+ Duo locations

[MikeXG]

A friend and I duo religiously. We have several duos and mix and match as we level up. We seem to be hitting a wall at 52/53. We both know the XP drops off and every level is a "hell level". but it seems locations viable for soloing just don't cut it for duo XP at the higher levels. Are there any good locations out there that are a bit hard solo but not hard enough where a full group is required? we have several combinations of classes so most tactics are viable. I have a Bard, Necro, Ranger, Druid - and he has Monk, Chanter, Shaman.

We usually follow the per level hunting guide and just go to solo spots a level or 2 earlier or a group spot a level or 2 into it depending on the camp.

Anyway - if anyone has some viable duo locations for the mid 50s I'd really appreciate it, that or its the slow journey at solo camps, or joining some PUGS.

Thanks!