RPI3 arcade monitor color res issue

[taccom]

Hi everybody I have a Raspberry Pi 3 outputting through a Gert VGA into a jpac. My monitor is a kortek/Sharp image ktm-f 26. The image looks great on my factory SF2 championship board and when configured for vga the Rpi3 looks great on a vga tv through the RPi3. But when its configured for 15khz 240p on my arcade monitor the text looks wrong then as the text fazes out it looks good. Also the colors are wrong and splotchy for instance liu kang in arcade umk3s chest has blue splotches. When the rpi3 is booting the pre retropie text is perfect once retropie is booting the colors and text are all off

I have my factory config file on modified with these lines
disable_audio_dither=1
dtparam=audio=on
dtoverlay=vga666
enable_dpi_lcd=1
display_default_lcd=1
dpi_group=2
dpi_mode=87
hdmi_timings=320 1 16 30 34 240 1 2 3 22 0 0 0 60 0 6400000 1 #240p

Also my retroarch has only been changed to 320x240 in the windowed res

[taccom]

[hypnoshock]

Hi, did you get anywhere with this? I have a similar problem. I tested the resitors on my Gert 666 board and they appear to be correct. Is it that it's trying to display 888 instead of 666 so some of the colours are wrong? I can't quite work out what's happening here.