I have the same issue. Managed to make it ok-ish with the settings, but if you want lower volume of the CW tone you end up with clicks or total fading of the tones.
My settings right now are:?
Semi QSK ON
Side tone volume 60
Sidetone abs/rel - Relative
With this settings the clicks are almost non present.
You can try restart after setting as it seems to me that it does not change right away.
73 de LZ3OM