APM 2.6 problem with stability

Dear
I’m biding a new quad with APM 2.6 controller. I read manual and do calibration of RC, acco and compass. Then I do calibration of ESC. Everything OK until now. But when I try to fly my quad is going in back.
I really don’t know what to do. Motors and propellers are at right position. Take look video
youtu.be/SD2Kjl2hMuo

@S56JSC,
Please provide data flash logs to help troubleshoot your issue.
Wiki http://copter.ardupilot.com/wiki/common-downloading-and-analyzing-data-logs-in-mission-planner/
Regards,
TCIII GM

Log files is to long (more then 2Mb) I attach it in dropbox. I hope it is OK
It look like it doing wrong (invert) correction on pitch.
Thanks for help

log file:
dropbox.com/s/lqyr5ny1d3qer4j/1.zip?dl=0

Any idea?

thanks