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First of all diagnose that there is no phase angle difference between3 phases, secondly Use brand made motors or their winding should be of pure copper, third use some capacitive load along with motors (Energy saver or electronic Chooks). Use of inverter is the best to reduce lose and cause for betterment of power factor.
Try to change some inductive motors to synchronous types with the same HP rating for the load requirement if the cost of this changing is practical than using capacitor banks.
synchronize motors
