I decided to upgrade to the muffled D4 from danger den after all, and changed the hose routing a bit, with a T instead of the res.
Still testing stability, but 2479MHz and 1.95Vcore (set in bios, MBM reports 1.9) seems ok in gaming, and at the same (reported by socket) temps that 2365 gave me before at 1.90Vcore.
The eheim is for sale if anyone wants it.