MoveIt acceleration scaling factor violated

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I'm currently testing moveit on custom hardware using ROS Indigo. I'm finding that the acceleration scaling factor isn't being obeyed for any of my joints. My joint_limits.yaml looks like this:

joint_limits:
  pitch:
    has_velocity_limits: true
    max_velocity: 0.06
    has_acceleration_limits: true
    max_acceleration: 0.01
    has_jerk_limits: false
    max_jerk: 0.005
  slew:
    has_velocity_limits: true
    max_velocity: 0.04
    has_acceleration_limits: true
    max_acceleration: 0.01
    has_jerk_limits: false
    max_jerk: 0.005
  extension:
    has_velocity_limits: true
    max_velocity: 0.07 #0.06
    has_acceleration_limits: true
    max_acceleration: 0.05
    has_jerk_limits: false
    max_jerk: 0.025

Given an acceleration limit of 0.01 rad/s/s on the slew joint, scaled by 0.3 I'd expect to see an acceleration no higher than 0.003 rad/s/s. Here's the velocity output from rqt;

That's a change in velocity from 0 rad/s to 0.04 rad/s over 1.1 s or 0.0363 rad/s/s acceleration. I'm setting the scaling factor using the text box in the planning section of motion planning in RVIZ. My trajectory is just a more or less linear swing from one position to another across about 2.5m. I plan and execute the trajectory using the GUI in RVIZ and execution is successful aside from these constraint violations.

Am I fundamentally misunderstanding the purpose of the acceleration scaling factor? Surely it should force moveit to obey acceleration constraints? As far as I can tell, moveit doesn't obey my acceleration constraints at all. Velocity constraints are obeyed just fine. My next step is to test IPTP.

I've implemented a hardware controller using ros_control that's checking and enforcing joint limits (position, vel and supposedly accel) at 10Hz. As far as I can tell the hardware controller is behaving as expected.

Thanks for you help!