Had same hight latency and jitter on simple .5km ptplink with 2x SXT ver 6.2
I now have steady 3ms.
I discovered that NV2 needs continuous data flow of at least 1MB x 1MB
I set a 1MB x 1MB bandwidwidth test running between point a and point b.
While the data was flowing low latency almost zero jitter.
as soon as I stop the bandwidth test latency and Jitter hits the roof again
Hope this info is useful