Altitude fluctuating about 10m in auto mode

Hello,friends.

My plane is about 5.5kg, wingspan 1.8m.Firmware 3.5 As below 。
614a8286a45b9d2fbe893d3fab445ba20ef67ef3.jpg
The altitude fluctuating more than 10m .Here is my test,the designed altitude below was 100m.9c5eda5371cae56855ff2dfc0ef8b497390b4df4.jpgIt flies well in FBWA mode, maintain the airspeed well, hit the flight course well.
And i try to do the TECS tuning ,including adjusting TRIM_ARSPD_CM,TRIM_THROTTLE, TECS_TIME_CONST.But without apparent improving.
Log is a little big,you can download it below.
Log
Hoping your reply,Thanks.

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