I wouldn't worry about the pressure. Sounds fine considering the increased size of the new filter. Theoretically the lower the flow the better for filtration. For a pool your size the pump should be just fine and the filter is oversized but that's OK. There are so many variables in a pools plumbing that an exact calculation is almost impossible and in my opinion those curves are great for general guidelines to get you in the ballpark. Relax and enjoy.
Al