The Principle of Maximum Conformality (PMC) systematically eliminates the renormalization scheme and renormalization scale uncertainties for high-energy processes. The resulting PMC predictions are scheme independent, and the residual renormalization scale dependence due to unknown high-order terms are negligible at the next-to-next-to-leading order level. By applying the PMC scale-setting, one obtains comprehensive and self-consistent pQCD predictions for the top-quark pair total cross-section and the top-quark pair forward-backward asymmetry in agreement with the experimental measurements at the Tevatron and LHC. As a step forward, we determine the top-quark pole mass via a detailed comparison of the top-quark pair cross-section with the measurements at the Tevatron and LHC. The results for the top-quark pole mass are $m_t=174.6^{+3.1}_{-3.2}$ GeV for the Tevatron with $\sqrt{S}=1.96$ TeV, $m_t=173.7\pm1.5$ GeV and $174.2\pm1.7$ GeV for the LHC with $\sqrt{S} = 7$ TeV and $8$ TeV, respectively. These scale-independent predictions agree with the average, $173.34\pm0.76$ GeV, obtained from various collaborations via direct measurements. The consistency of the pQCD predictions using the PMC with all of the collider measurements at different energies provides an important verification of QCD. Show Partial Abstract