Dell U3818W resolution

Hi, i have mojave sucessfully working on both my latitude 7480 and optiplex 7060, but for some reason I'm not able to get my monitor working properly. I've tried fixEDID, manual ways etc, but as soon as I go above 2560x1080, example 3840x1600 which is the native res of the monitor just shows as a small window in the middle of the monitor, with black bars on all sides, both computers

Photo: http://imgur.com/a/qkJs6Rq

E: title U3818DW

submitted by /u/-mznGTR
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