Mortgage Interest Deduction - Acquisition Debt and refinance cash out

Need clarification about mortgage interest deduction.

The acquisition debt is approximately $350,000.  Did a cash out refi of $419,000.

$40,000 was used for home improvement.  The balance of $29,000 was used towards purchase of land.  

It is my understanding that the interest on $29,000 is not deductible, but the rest of the interest based on loan amount is deductible.  Is this correct?

Also, do I have to keep entering the loan as a refi cash out for the duration of the loan?