Vice versa, pulling should always outnumber pushing. If not, you end up with the shoulders being pulled forward which not only limits your ability to stimulate your chest and thus strengthen it, but also puts you at a greater risk for injury. Having a stronger upper back and set of lats also gives you a better base to push off of when benching, making the movement more stable and allowing you to increase your press numbers.
I know that you can't do many pulls up, but keep in mind this is all your pulling exercises vs pushing exercises. Do high rep rows, pull downs, etc. while still keeping a focus on your pull ups. Use the search function to find out strategies on how to increase your pull up numbers, there have been quite a few articles written this year alone on how to do so.