1m apogee DLG, Balsa build, thermaling into strong wind

Hi guys, this is my 1-meter DLG, scratch build with 2 channels - ruder-elevator.
wing length 1 meter
plane length 73cm
Flying weight 118gr
Wing area 13dm2

Build Details:

Wing Plans: http://charlesriverrc.org/articles/apogeehlg/apogee40_wood.pdf,
How to build: http://charlesriverrc.org/articles/apogeehlg/markdrela_apogeehlg.htm#Wood%20Wing, I have also added a 2.5mm hardwood (basswood) at the leading edge, which gives a tremendous crash resistance ability.
Wing shaping: http://charlesriverrc.org/articles/construction/markdrela_airfoilshaping.pdf
Wing cover, Oralight 36g/m2: https://www.hyperflight.co.uk/extras/Oracover-Covering-Weights.pdf
Tail plans (out of 2,5mm balsa sheet of 28grams) the moving part of the vertical stabilizer is 3.8cm wide : https://static.rcgroups.net/forums/attachments/4/1/0/4/2/6/a11960027-209-getfile.jpeg
Servo calculator: https://www.mg-wohlen.ch/tippsundtricks/technik/servoanlenkungs-simulator
Carbon boom 5mm outside diameter 4mm inside from an arrow shaft: https://www.npapadakis.gr/%CE%B2%CE%B5%CE%BB%CE%B7-carbon-avalon-classic-p-2314.html?sess=j57ndm6jf839v8t6mkp5v3aqb5,
Servo 3,7g: https://www.banggood.com/3_7g-Micro-Analog-Servo-GH-S37A-For-RC-Airplane-Helicopter-p-1116559.html?rmmds=myorder&cur_warehouse=CN
Receiver: https://www.banggood.com/Flysky-FS2A-4CH-AFHDS-2A-Mini-Compatible-Receiver-PWM-Output-for-Flysky-i6-i6X-i6S-p-1214269.html?rmmds=myorder&cur_warehouse=CN
Battery: 3,7V 450mAh

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