First, every county in PA is slightly different and you should consult with an attorney in your specific county. Most Courts will follow the pattern that you and your ex-wife have been following over the past 2+ years. That is not to say it is impossible to get 50/50 physical custody. You will have to provide the Court with a good reason for this change. If things are going well under the current set up, the Court may not be willing to make large changes. So, the more "ammunition" you have the better. Having your own place is certainly persuasive and may get you more time.
You should verify the process in your area. Many counties use the Conciliation Conference method where the first step is a Custody Conference where a Court appointed master tries to work out a deal between the parents. Usually these masters have no ability to fundamentally change custody. This is important as you may have to take this matter to a custody trial to gain more time with your children, unless your ex-wife agrees.
One other important note, the court should also listen to what your kids say at this point. They are both old enough to tell the Court what they feel. For obvious reasons, more weight is placed on an older child's opinions.
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