Just read the EK part, sorry to say but I have to say EK's quality too has been unacceptably poor for me so I wouldn't say it couldn't be EK's fault or manufacturing issue. The first time I made an order to them which was 3xEK-FC 780 GTX TI Acetal+Nickel blocks, was that all of the blocks had deep scratches in one corner of the blocks, and one of the blocks was completely missing a screw hole LOL. They sent me parts later on and apologized, as there was a piece missing. It's just me but I am very picky when it comes to things like this. The good thing was that they didn't leak...well, later on the nickel plating went bad, but I got rid of those blocks and later on I had Acetal+Copper blocks without issues.
About PPCs...I ordered a Corsair 800D side window from them with pre-cut fan holes, one of the holes was a bit off compared to others, and their reply was that there definitely cannot be an issue since they have tested them with fans. Oh boy..
Hope you'll get it all sorted.
i9-7980XE / Asus Rampage VI Extreme / Corsair Dominator Platinum 64 GB 3200 MHz CL16-18-18/ Palit RTX2080TI / Intel 750 NVME / Samsung 1TB / Corsair AX1500i / Phanteks Enthoo Primo / Asus PG279Q