Arming into "AirMode", bypassing MOT_SPIN_ARM

We are using a centered “sprung stick” with PILOT_THR_BHV=7. The issue we have been seeing is the flight controller is arming straight into “Air_Mode”&(MOT_SPIN_MIN) - (if i’m remembering the flight modes correctly).

If I set PILOT_THR_BHV=0 and hold the stick down It will start at MOT_SPIN_ARM.

Any ideas are greatly appreciated.