The F-15C GE and Su-30SM are both 14.3, both of those are arguably sidegrades to the J-15T. However you do have a point regarding the J-10C and PoBIT.
In a more ideal world the AESA EFTs/Su-30SM2/Rafales move to 15.0, the F-15C GE/Su-30SM&MKM move to 14.7 (J-15T stays at 14.7) while planes like the F/A-18E&F/PoBIT/J-10C remain 14.3 (JAS39E either remains at 14.3 with no fixes or gets a whole bunch of the needed fixes and moves to 14.7).