Chest/Back Imbalance

I am doing a 4 day, push/pull split routine and was wondering how to handle my chest/back muscle imbalance.

Not that my chest is very strong or muscular, but rather my chest is very weak, curved and my shoulders are slouching forward.

So, on my push days, I am doing bench press and obviously i am using more weight for my bench than i can doing any rows on my pull days.

so, how can i work on my back and try to fix my posture issues when i am doing heavier pushes then pulls?

or should i just stop bench presses for w hile and focus on rows for my back?

Do twice as much pull as push until your bent row is similar to your bench. Instaed of splitting the push/pull split horizontal/vertical. That way you can do more pull. You may need to do some rehab work on your shoulders.