You are far better off with a smaller pump even if you run it longer. Smaller pumps are usually much more efficient at turning over a pool than a larger pump. So I would stick with the pump you have. It is more than sufficient even for that size pool and you are correct about putting to much flow rate through a filter but it depends on the size of filter. You may even be able to shorten the run time if you want to save on energy costs.
What is the brand/model # of your pump and filter?
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