Difficult to say without evauation.
One can always obtain another opinion at a major academic medical center. Unfortunately more dilation seems to be a mainstay of therapy.
A more extensive surgical procedure (i.e. incision) can be considered - but as you said, the scarring can lead to a worsening of symptoms.
Depending on the site of the sticture, a stent may be considered.
These options can be discussed with your personal physician.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.