Volumio with 3.5" TFT Touch Screen (GPIO) RPi 3B+

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Hi, Thanks to @gvolt advice, I have successfully connected my 3.5" screen, I’ve detailed what I’ve done here.

A little detail that bother me : I can’t make touch to the borders of the screen (about 4 millimeters). Something like that (the cursor can’t go over the red zone) :
image

I presume that I have to modify 99-calibration.conf but it doesn’t seems to have any effect.
Do I need to use evdev to calibrate ? How to choose the right values ?

Here my actual configuration :

cat /boot/config.txt

initramfs volumio.initrd
gpu_mem=32
max_usb_current=1
dtparam=audio=on
audio_pwm_mode=2
dtparam=i2c_arm=on
disable_splash=1
hdmi_force_hotplug=1
force_eeprom_read=0

include userconfig.txt

cat /boot/userconfig.txt

dtparam=spi=on
dtoverlay=tft35a:rotate=90

ls -al /etc/X11/xorg.conf.d

95-touch_display-plugin.conf
99-calibration.conf
99-swapxy.conf
99-swapxy.conf.save

cat /etc/X11/xorg.conf.d/99-calibration.conf

Section "InputClass"
        Identifier      "calibration"
        MatchProduct    "ADS7846 Touchscreen"
        Option  "Calibration"   "268 3880 227 3936"
        Option  "SwapAxes"      "0"
EndSection

cat /etc/X11/xorg.conf.d/99-swapxy.conf

Section "InputClass"
        Identifier "SwapXY"
        Option "TransformationMatrix" "0 -1 1 1 0 0 0 0 1"
        MatchIsTouchscreen "on"
EndSection

cat /usr/share/X11/xorg.conf.d/99-fbturbo.conf

Section "Device"
        Identifier      "Allwinner A10/A13/A20 FBDEV"
        Driver          "fbdev"
        Option          "fbdev" "/dev/fb1"
        Option          "SwapbuffersWait" "true"
EndSection