Why are you decreasing the LOC?
Paragraph 5b(f)(3)(iii)
By contrast, a consumer could agree to a new credit limit for the plan, although the agreement could not permit the creditor to later change the credit limit except by a subsequent written agreement or in the circumstances described in §226.5b(f) (3)(vi).
Paragraph 5b(f)(3)(vi)
1. Suspension of credit privileges or reduction of credit limit. A creditor may prohibit additional extensions of credit or reduce the credit limit in the circumstances specified in this section of the regulation. In addition, as discussed under §226.5b(f)(3)(i), a creditor may contractually reserve the right to take such actions when the maximum annual percentage rate is reached. A creditor may not take these actions under other circumstances, unless the creditor would be permitted to terminate the line and accelerate the balance as described in §226.5b(f)(2). The creditor's right to reduce the credit limit does not permit reducing the limit below the amount of the outstanding balance if this would require the consumer to make a higher payment.
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The opinions expressed are mine and they are not to be taken as legal advice.