  Recent data on the high-pT pion nuclear modification factor, $R_{AA}(p_T)$,
and its elliptic azimuthal asymmetry, $v_2(p_T)$, from RHIC/BNL and LHC/CERN
are analyzed in terms of a wide class of jet-energy loss models coupled to
different (2+1)d transverse plus Bjorken expanding hydrodynamic fields. We test
the consistency of each model by demanding a simultaneous account of the
azimuthal, the transverse momentum, and the centrality dependence of the data
at both 0.2 and 2.76 ATeV energies. We find a rather broad class of jet-energy
independent energy-loss models $dE/dx= \kappa(T) x^z T^{2+z} \zeta_q$ that,
when coupled to bulk constrained temperature fields T(x,t), can account for the
current data at the $\chi^2<2$ level with different temperature-dependent
jet-medium couplings and path-length dependence exponents $0\le z \le 2$. We
test the sensitivity of predictions to different skewed energy-loss
fluctuations via a convenient scaling factor distributed in a finite range $0<
\zeta_q < 2+q$ with unit mean. While a previously proposed AdS/CFT jet-energy
loss model with a temperature-independent jet-medium coupling as well as a
near-$T_c$ dominated, pQCD-inspired energy-loss scenario are shown to be
inconsistent with the LHC data, once the parameters are constrained by fitting
to RHIC results, we find several new solutions with a temperature-dependent
jet-medium coupling. We conclude that the current level of statistical and
systematic uncertainties of the measured data does not allow a constraint on
the path-length exponent z to a range narrower than [0-2].
