Yeah mine are on dampened mounts as well, all give off a hum at 100% still likely won’t run them that high. Am seeing about 333L/hr with no blocks, 6 GTX radiators and a GTS, plus about 10-15 90 degree fits atm.Conductivity and WQ means you need to flush it out some more. I had the same thing and it took a couple fill and drains with DW to get it to 100% WQ and after about a month its at 98%.
3 D5s and none of mine can be heard, they are all on dampened mounts though and get me 325L/hr with a filter, CPU block (high restriction Optimus ATM, two HK GPU blocks and 4 rads with a double pass GTR 420 being the most restrictive.
I’ll do a few more flushes and see if I can get closer to 100% quality, only a temp setup till my KPE block and I’ll switch to XTR fluid.
It’s interesting watching how much heat the D5’s dump into the loop, about 5 degrees or so after a couple hours.