MSI Afterburner won't apply voltage curve to all cards

[WaveRiderx]

On my 1080ti rigs I find a more efficient hash undervolting to 900mv at 1900 core, while still getting good hash but at much lower heat and power.  could probably go higher core but haven't really tried yet.

Anyway, I noticed afterburner will only apply the curve to one card, even with the apply to all cards option set and even if I unlink them in gpu option window and try and do each one at a time separately, only one card will hold.  They are all the same EVGA SC Black Edition.  

Tried uninstalling and reinstalling.  Fresh Win10x64 LTSB updated install.

Thoughts?  I know I need to switch to something like simplemining if they allow voltage control that is, but for now would like to get this situated.