General BRRRR question

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While performing analysis on a BRRRR deal I'm noticing that when it comes time to REFI if I underestimate my ARV I could potentially hurt/lower my cashflow due to the higher loan costs I will be required to pay. Is this correct? If so how can I get around this? Obviously having the ARV come in higher than expected is a good issue to have but I don't want my cash flow to be jeopardized. Thanks.