Pigments 3 aftertouch mapped to Master Gain when using Sensel Morph?

[MeesterLaser]

Hi -

When using a Sensel Morph with Pigments 3, the aftertouch or pressure seems to cause the master gain to fluctuate wildly.  This did not happen with Pigments 2, and it does not happen when I take the Sensel out of MPE mode. 

CC# 106 on channel 2 appears to be the culprit, but I'm not sure how or why, or what I can do to change this.  Any advice would be appreciated.

Thanks in advance.