We present results from a jet energy loss calculation using the Gyulassy-Levai-Vitev (GLV) formalism and bulk medium evolution from the covariant transport model MPC. At both RHIC and LHC energies we find that realistic transverse expansion strongly reduces elliptic flow at high pT compared to calculations with transversely frozen profiles. We argue that this is a generic feature of GLV energy loss. Transverse expansion also leads to stronger high-pT suppression, while fluctuations in energy loss with the location of scattering centers weaken the suppression. But, unlike the reduction of v2, these effects nearly disappear once alpha_s is adjusted to reproduce R_AA in central collisions.
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