Here are my observations
All attempts to upload were successful this time
The only aborted attempt was when i accessed the settings pane during a transfer (i did not ok or change anything, but this crippled the upload permanently)
The important thing for me is to note the following
The accessing of the Settings pane will disable Turbo mode, and this results in much slower transfer - Turbo mode is not user negotiable after it is disabled - so before you press send - ensure that the Turbo toggle is still active
The Turbo mode makes a big difference in speed - as does enabling even 1 or 2 ticks delay on OSX
As it seemed to work well in Turbo Mode with either SDS Handshake On or Off I will leave it on, it wasn’t notably slower for small sample uploads
Either way - i have already developed a routine where I restart C6 if the device isn’t automatically selected or if Turbo isn’t on - then i leave the settings well alone
The important one to have preselected is Extended SDS - to get the names transferred
This was for Mavericks btw