When I'm not sure on a pull I pay attention to the healer. As they're usually behind you and if they keep running, it's a clear sign to keep going. And I mean in a "I thought I you were still pulling" and now a "I'll pull for you" keep running. Take Bardam's for example, some healers hate big pulls there. I'll pull those three hoppits and watch if the healer stops or run past me. And nothing is a bigger stop sign than a SCH using their Salted Earth. I had a WHM more or less guide me with Asylum once. One of the smoothest runs.