Go with the smaller GPH pump. Or, even better, go with a variable speed.
Clean the filter and see if you get better flow.
If not, then see if the heater flow switch is adjustable, if so reduce it until you get into range.
Very good question, it would be nice to know what the best of the best when it comes to the tools…
We actually have a post that explains that here: https://yourpoolhelp.com/what-documents-are-needed-to-install-a-new-in-ground-pool/
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