As @KrisD15 mentioned, it's unclear how having a larger loan balance would benefit you. You only get to deduct the amount of Mortgage Interest you paid as shown on the 1098 (or less than that if your deduction is limited by a larger than 750K loan balance).
Have you actually entered your 1098 as issued into TurboTax? Enter all your other Itemized Deductions and all income to see the tax outcome.
Here's detailed info from the IRS on Home Mortgage Interest and Mortgage Interest FAQ's.
@MatthewM
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