Altitude (pitch) correction too hard, what to tweak?

I use My Fly Dream Twin for a while and it flies very well, the only thing I notice is that corrects altitude too violently, using too much pitch to go down then a lot of motor to gain altitude again, correction goes from 10 to 20 degrees, here a log from the Reach GPS onboard showing a 45 minutes flight.
What is best to tweak to correct this?
Thank you

It sounds like you should investigate the Total Energy Control System: TECS.

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