Finally after reading your replies on other posts as well, made few changes.
1- Replaced both fans with speedy ones. Blade edges sharp and not de-shaped.
2- Made sure that condenser and radiator take maximum air, sealing spaces in between and other places with foam.
3- Changed radiator to two-channel one.
Cooling is improved, infact very improved in day times. It was barely noticeable in day time, when these changes were not done. But it is comfortable now.
Thank you Xulfiqar bhai for your valuable suggestions and advices. These advices and suggestions doesn't gets digested by our Ustaad jees, but pays off if done rightly.
Now, as I still want to install AUTO RADIATOR FAN + THERMOSTAT, and so I did. Cooling was same.
But, few other problems showed up.
1- At cold engine, RPMs stable.
2- Once reaching its required temperature, Idle goes high up to 1.5k RPMs. Brake servo loose brake assist and gets hard.
3- Engine changes its sound, like running under load.
4- Car pickup significantly decreases.
Pls suggest what to do.