The partonic transport approach BAMPS (Boltzmann Approach to Multi-Parton Scatterings) aims to describe microscopically the partonic phase of ultra-relativistic heavy-ion collisions by perturbative quantum chromodynamics. To this end, it numerically solves the 3+1D Boltzmann equation by allowing interactions among all parton species: both elastic 2→2 and inelastic 2↔3 collisions for gluons as well as quarks. For the inelastic collisions, we employ the improved Gunion–Bertsch matrix element, which cures problems of the original Gunion–Bertsch result in characteristic regions of the phase space. Based on extensive numerical calculations, the improved matrix element agrees well with the exact pQCD calculation. By employing the improved GB matrix element together with a running coupling evaluated at the microscopic scale, we present our recent results for the suppression of high pt particles as well as the collectivity of the bulk medium and compare them to LHC data of the nuclear modification factor RAA and the elliptic flow v2. Furthermore, we present studies of RAA for different hadron species and the momentum imbalance AJ of reconstructed jets.