Yup...in a duo yesterday anything that was r10-12 above us was conning Blue (even though there was wide variety in difficulty). Being in a larger party to fight something more challenging would have been a waste...it would only speed up the process at a reduction in SP. We were two conjurer's so battles weren't fast, but if one of us had swapped to a DoW with the Con healing/nuking in between we would have moved fast and maxed SP.