You are allowed to provide a revised loan estimate at any time. But if your goal is to provide a revised loan estimate and to be able to adjust the tolerance, thereby avoiding a cure, then the revised disclosure must be due to a changed circumstance or a an interest rate lock to name two of the five scenarios listed in Section 1026.19(e)(3)(iv) under which tolerance adjustments are allowed. This could qualify as a changed circumstance, which includes new information specific to the transaction that you did not rely on when providing the original loan estimate. The interest rate lock is not such a good fit since it is allowed if the points or lender credit change because the interest rate was not locked when the original loan estimate was provided.
If you go with the changed circumstance option, the revised disclosure must be provided with in three business days (general rule) of receiving sufficient information to establish a valid reason for issuing a revised disclosure.