He sent me a working set, here is the history of the set's performance:
Upon first install with relay, it works every now and then, most of the time during drives, it flickers.
Fixed flicker by following another user on this forum by adding a 16v 4700uF capacitor in the relay harness inline
Shortly after, maybe a day, one of the ballast failed, so I was running my hylux 35w ballasts that did not require any relay harness
Found a local shop that sells 55w ballasts off the shelf, replaced it, working ever since!
Even though they are 2 completely different make ballasts, the new one I bought was a lot smaller than the DDM one, they seem to have the same output and the same warm up time