Hi and welcome to the Chiari forum.
More testing should be done before seeking a neurosurgeon as you will want to rule out ALL related conditions first and make sure you have a true Chiari specialist.....not all areas have a Dr so you may need to travel....here is the list for your state....keep in mind this is not a referral nor an endorsement for those listed....you must research the Drs to determine if they are true specialists and if one of them is right for you.
Dr. Mahmoud Nagib
913 East 26th Street
305 Piper Building
Minneapolis, Minnesota 55407
Dr Nicholas M. Wetjen, M.D.
Mayo - Rochester, MN
Neurosurgery & Pediatric and Adolescent Medicine
See what the Dr looks at...if he/she is focused on the herniation length and not any thing else like CSF flow, or related conditions then this may not be the Dr for you.
Ehlers-Danlos* is another very important condition that is related and needs to be ruled out early.
MRI's of the brain, cervical, thoracic and lumbar spine as well as a CINE MRI.....
Disk issues is common for those with Chiari....especially those with EDS*
Look up NS in your area you might have too go a ways its best to research for yourself and directly ask if it a chiari if not what is it and if you don't understand don't be afraid to tell Dr to explain it where you understand