I feel like Dalriada is the only issue when it comes to low-manning Bozja content as the electric floor after the first boss will quickly kill you even with the bloated HP pools from the echo buffs, which basically requires that you have at least six people to clear the instance.

The CEs can easily be solo'd as the echo buff will boost your HP/damage by around 400%, which when coupled with Beast/Bloodsucker for lifesteal makes you virtually immortal.