It should also be noted that the AL-31 M1 and M2 both comes with thrust vectoring control. I don't think that during testing the J-10B airframe or the software was designed or tested for TVC. If its not the AL-31 M2 with 145 kN but the AL-31 M1 with only 132 KN then what happened to the WS-10A that also has 132 KN ?
You do realise there's more to an engine other than thrust. Yes thrust is important but it is far from the whole picture. Just like pixels for cameras or clock speed for CPUs.