Slow charger For smart bms to work balancing?

I have 12s4p 4a charger for my setup. The problem my battery didn’t balance itself. Im using smart bms i buy from aliexpress. From my research. Smart bms cant balance fast charger. Charge bleed wont be fast enough to recover and balance itself. I need to find a slow amp charger. My charger only trigger cc-cv at 4.15 which. Near the end. And make my low bat pack stop at 4.0v because highest pack was at 4.2 (bms protection thinggy.) . My question is . Is it possible to adjust potentiometer on my charger to reduce high amp . So my bms will work to balancing all cell?

Here are attached pictures inside my charger

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