Yes unfortunately the drops are that low. If I remember correctly during my run to get the Kiren I only picked up 2 normal and one large Levin orb, one vortex feather, and I think a crag heart. That was over the course of around 250 ish kills between all the ex primals. Highest number of kills were for Ramuh and Titan since I had the worst luck with those two ponies. (This was all back before Heavensward so that gives an idea of just how low the drop rate is.)