Kinki Studio EX-M1+ users - I’v got a volume pot question!

Hi friends! I’ve recently puchased a Kinki Studio EX-M1+ after hearing the first/original version at a friends house. Kinda fell in love with it:) My version, the latest, has a volume control that increases in increments from 00 to 100, using an R2R ladder attenuator. Sounds great, no doubt. But, I really have to turn the knob to get decent volume levels. 50/100 is really not extremely loud on my Pioneer/TAD S-2EX’s (86.5 db). Experience with these speakers tell me they might be getting around 15 Watts at this volume level. Normal listening level is around 35-40/100. This kind of puzzles me. The attenuator can clearly not be linear, but this seems extreme to me… Any input from fellow EX-M1+ users would be appreciated! Thanks!