Just went through JF17 radar thread,
Seems LKF603E is for block 1 & 2 air cooled & KLJ for block 3 liquid cooled . Correct ?
Su30 mki upgradation is not yet finalised , I doubt you ll wait for the specs to be out to choose your radar & it has big radome with more power from 2 engines , definitely will house best radar that's allowed to have.
Rafale Aesa radar , I am not sure but it ll have a different philosophy I guess since radome is not big.
Tejas MK1A will have high TR units , liquid cooled but not sure of available power . So I am guessing KLJ radar cannot seem to compete with any of these radar.
Delays may be primarily due to other reasons not because of Indian factor.