N1 = 6,451 RPM and N2 = 15,181 RPM, the engine produces 921 lbf, which is only 15.35% of the 6,000 lbf target.
This suggests the engine is either operating at a very low power setting (e.g., partial throttle) or is significantly under performing.
N2 = 38,704 RPM could achieve 6000lbf if...