Naza-M idle speed oddities / Arming problems

So...I have been building a new Y6 hex that is displaying an odd behavior. With the default motor idle speed settings, the motors do not spin at all after arming until I raise the throttle to 50%.

In the motor settings, I can raise the idle speed. After maxing out the idle speed, the motors behave the way that I would expect: After arming, the motors spin up...from 0-50% throttle, no change is made to the motor speed, but at 50% throttle the motors spin up enough for liftoff.

But...with the 'recommended' idle speed? No movement at all after arming.

Should I be concerned about the lack of movement at 'normal' motor idle speed? Is this indicative of ESC mis-calibration or some other problem? Thanks.

- Jareth

Build:
Radio: Futaba T8J with R2008SB receiver
Frame: VulcanUAV 900 in Y6 configuration
Flight Controller: Naza-m V2
Motors: T-Motor MT3515-15 KV400
ESC: Maytech 40A Opto
Batteries: 2x Turnigy NanoTech 5000mAh 6S
 

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