After months i finally decided to move my PC from Define S2 to O11D XL in Silver and couldn't be happier! Really well thought out case which isn't huge behemoth but still can accomodate a lot of watercooling hardware.
In the future i want to add another 360mm radiator at the bottom (HWLabs GTX or SR2), swap all the fans with A12x25 Chromax and change the reservoir for Singularity Protium or HeatKiller Tube so i can use top mounted fitting and get rid of that long tube from side rad to reservoir.
Btw. there's no backplate on a GPU because it was shorting video outputs.