throttle waves on RTL, and high speed on Mentor

Hi, I'm testing my new plane a Multiplex Mentor, all good in stabilized mode, I've calibrated the compass, but when I change to RTL the plane increase too the velocity to approximate to home 80-90km/h aprox.  to home , the configured values are on the picture.

And when the plane arriving to home and loiter start, plane can't hold altitude and the throttle start to increase and decrease, more and more until I have to change to manual, because the navigation become dangerous.

You can see in the tlog file between 13:27:15 and 13:28:55

Somebody knows what happend, thanks.

2012-10-09 14-03-11.tlog

Param.jpg

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