I don’t use LabView, so this is only a general recommendation. If the project is in Arduino, then I would set the DXLs Baud Rate as high as possible (i.e. 4.5 Mbps) - see info from Robotis e-manual below:
Then use Sync Read Write to control and access data from the DXLs. There is also Fast Read but so far I could not make Fast Read to work for me in Arduino.
You may get more than 70 Hz then, may be 100 Hz but 400 Hz is way too high for these DXLs, I think. From my experiences in using Sync Write Read to 4 DXLS set to 1 Mbps, I got only about 64 Hz per set of Write-Read with an ESP32 S3 (@ 240 Mhz) - see actual data shown in this post: