If the sink rate is very poor, it might be effected somewhat by the spoileron configuration. The up trimmed ailerons are in fact spoilerons as well as they are simulating wash out.

Also keep in mind that they are simulated wash out only to the extent that the plane is kept fairly level. If roll axis is commanded that brings the aileron neutral to the wing, the simulated washout has temporarily disappeared leaving the wing possibly open to tip stalling.