RHRS should be at larger angle for elastic scattering, which can be seen from dp plots of RHRS and LHRS: elastic scattering electrons in RHRS have lower momentum. But RHRS has higher rates. The small peak at the most right position in dp spectrum of RHRS is larger than that of LHRS, I don't know if it is the reason, and if also the reason for the events with large negative VertexZ from upstream (from Aluminum?).
RHRS 22220
LHRS 3132