AmigaOS 4.1FE Update 3 resolution setup problem

Hi guys,
I am setting up a "new" ssd for my Sam440ep to show at Pianeta Amiga 2026. I did a fresh installation of Amiga OS 4.1FE up to Update 3. Everything is fine but I have problem to setup a resolution of 320x240 (using VGA not DVI). I also checked and then copied my old Radeon monitor from my old (but still current setup) AOS4.1FEU1 (with Enancher Software for Sam440 Edition) but it still doesn't work.. that's strange because if I connect my old hd with the 320x240 resolution it works, but in this new installation, it doesn't... My only guess is that the Enancher Software for the Sam440 (light version available back in the days) changed something in the monitor setup but I am not sure about and honestly I don't remember what I did back in the days to make it work.. Do you have any idea to help me and figure it out the problem? Obviously the monitor is the same
Thanks a lot