You got your basics all mixed up
Longitudinal/bigger IWB ≠ heavier fighter
F22 is bigger and has a higher thrust than f35 but still carry smaller/lighter payload plus f22 and has a smaller combat radius than f35
Russia is in a hard place economically and we should leverage their know how in aerodynamic control to redesign AMCA mk2
Current AMCA mk1 should go on as it is with GE f414 but AMCA mk2 should be a new/improved beast.
To loose some weight we should drop TVC requirement and also get rid of elavators. Move the engines apart and voila
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