I take it even with this snr tweak it won't work if your line is banded by DLM?
It will technically "work" in the sense that it will indeed change the "target" SNRM.
The max attainable rate will increase in line with the target chosen.
It won't work how you would like and the banding will still cap the sync and therefore the "current" SNRM will remain high.
The same as how lines cannot exceed the product cap.
^^^Exactly as Chrysalis says.
Both are applied by setting the upper end of the current DLM profile.
If you work out how to bypass banding then you could in theory exceed your products cap (the sync at least).