RaspberryPi 3b+ and Pi2SCART - cannot make 4:3 CRT run fullscreen games

[davidkoleda]

Hello,
I am encountering issue with a Grundig P45-540 text CRT TV (this) and my retropie setup (details below).
TV is connected directly to pi2scart via SCART cable. Consider that I am based in EU and therefore PAL is what we have here.

The issue is that despite emulation station being perfectly rendered on the TV, games (whatever emulator) are run in a non-fullscreen window like in this picture CRT_pi2scart.jpeg.

I think the answer may be in the HDMI timings in the boot file which I kind of put blindly from a facebook post, seemed to work much better than the default ones suggested for pi2scart kind of everywhere which I think worked well for NTSC.

I attach here below the pastebins for
config boot txt file
retroarch cfg in /opt/retropie/configs/all folder
retroarch core options cfg in /opt/retropie/configs/all folder
psx retroarch cfg in /opt/retropie/configs/psx
snes retroarch cfg in /opt/retropie/configs/snes

Do you have any suggestions? Any help is greatly appreciated

Raspberrypi 3b+ with Pi2SCART HAT
Power Supply used: PROKORD 5.25 V - 3 A
RetroPie Version: 4.8
Built From: Pre made SD Image on RetroPie website
USB Devices connected: none
Controller used: BT 8bitdo SN30 pro x2
Error messages received:
Verbose log (if relevant):
Guide used: many posts from this forum as well as on pi2scart - pi2jamma facebook group
File: (File with issue - with FULL path)
Emulator: psx lr-pcsx_rearmed and lr-snes9x2010 and lr-mame2003-plus