Are you sure you're making neutral assessments?
Firstly, Mig-29KUB can take off sky-jump with 2x AAM, 3x tanks, 2x AShM... weight equivalent to 70-80% strike & 100% dogfight package.
I don't know why they'll carry 50% weapon/fuel, as you claim, when even NLCA took off with full fuel & 4x AAMs...