DLPDLCR2000EVM: Raspberry pi configuration using dtoverlay=vc4-kms-dpi-generic (raspberry pi os 12 bookworm)

Hi,  I am trying to configure the projector kit using the dtoverlay vc4-kms-dpi-generic in raspberry pi os bookworm lite. I am having issue finding the right parameters. I am using the projector with a resolution of 640x360, with the rgb666 format. It is working very well with the dtoverlay dpi18. I am using a custom pcb board so communication is not an issue.

The dpi generic is using rgb666 as default, and I translated the configuration of hdmi_timing and dpi_output_format from dpi18 to the new overlay format, (horizontal front porch, hsync, etc) so the config.txt now has the dpi18 commented out, and a new entry after the vc4-kms-v3d overlay :

*******************************
[...]

#dtoverlay=dpi18

#overscan_left=0

#overscan_right=0

#overscan_top=0

#overscan_bottom=0

#framebuffer_width=640

#framebuffer_height=360

#enable_dpi_lcd=1

#display_default_lcd=0

#dpi_group=2

#dpi_mode=87

#dpi_output_format=458773

#hdmi_timings=640 0 14 4 12 360 0 2 3 9 0 0 0 60 0 13824000 3

dtoverlay=vc4-kms-v3d
max_framebuffers=2

dtoverlay=vc4-kms-dpi-generic, clock-frequency=13824000
dtparam=hactive = 640, hfp=14, hsync=4, hbp=12
dtparam=vactive=360,vfp=2,vsync=3,vbp=9

#this shoulb be ok, but it seems to be worst
#dtparam=hsync-invert=1, vsync-invert=1
#dtparam=de-invert=1,pixclk-invert=0

*****************************************************************

with these parameters, I get an image, but it has some horizontal skewing, that can be work depending of the current content :, 

This is problematic. I can't use the correct parameters for the polarity hsync-invert, vsync-invert and de-invert without messing up completly the image. Did someone succeeded to configure the raspberry pi with this overlay? or even better, created a new overlay merged from the vc4-kms ?

*note, I can't revert back to dpi18 and commenting out vc4-kms-v3d. It prevents the libcamera from working.