I assume you've done at ATF change. If not, do that first using the ATF recommended for Chrysler units (not Dexron-Mercon). That alone may make a big difference.
You may be right about the seals, perhaps in the pump. As it gradually warms, it builds pressure better.
If no difference after the ATF change, or in addition to it, try the Lubegard product they recommend for Chrysler trannies. Any number of us have had better results in our transmissions after using it. I even had Mobil 1 ATF in my Ranger for over a year, then when I switched to LG Red, the improvements were amazing. Even if there isn't a change (your results may vary) it isn't expensive.
Be aware of ideologues who will tell you not to use LG products (or any additives of any kind anywhere under any conditions) yet have never used any themselves.